Why do feminists say 'teach men not to rape'?

You did by saying that rapists were simply normal people who committed mistakes. When you do that, you're playing the "not as bad as they're made out to be" card, which trivializes rapists.
Not to mention, it is completely irrelevant in regards to OP's question, as he asked why we should teach men not to rape instead of teaching women to take precautions, not your opinion on why men rape, and trivalizing rapists by saying that they're normal people who made a few bad mistakes does not help the cause either, thank you though.

True. Rapists aren't bad, they just made a mistake, and shaming them like that is wrong! Instead, teach women to not walk alone at night, to not wear too revealing clothes, cause it may make those poor men make mistakes and rape them, and if they do, it's on them!

No they don't actually.

Rape is defined as penetration with a penis.

20%? Well that's clearly a lie.

"The recent CDC report, based on surveys conducted in 2011, found that almost one in five women (and 1.7 percent of men) have been raped in their lifetimes. In a single year, 1.6 percent of women reported experiences that are considered rape—almost two million cases."

That's rape alone, and does not involve all of the cases regarding sexual assault.

Mincing my words again. I did not say the word mistake. I did not say any of the things you are claiming. So once again, reading into something that isn't there.

I don't think it is remotely irrelevant to OPs question . Considering teaching men not to rape does not necessarily mean sitting them down and saying "don't rape".
It can be something that is instilled with them through their lives, and could perhaps be something these rapists never got or possibly comprehended. It's about a lot more than just saying "don't rape". And a large part of understanding how to teach these individuals not rape, and instilling in them an understanding of their actions and future actions is to understand where their mindset is now.

Oh and yet again ignored the phrase. "you cannot prevent what you don't understand"...funny I wonder why you keep ignoring that,

So you think out of roughly 3.5 Billion women on Earth, 700 Million of them have been raped?

"The recent CDC report, based on surveys conducted in 2011, found that almost one in five women (and 1.7 percent of men) have been raped in their lifetimes. In a single year, 1.6 percent of women reported experiences that are considered rape—almost two million cases."

That's rape alone, and does not involve all of the cases regarding sexual assault.

"Most of them are just normal people who did a horrible thing, many feel remorse and guilt."
You are portraying them as normal people who made mistakes, but now are capable of feeling remorse and guilt. 1) That trivializes the issue.
Without your elaboration, yes, your answer becomes quite 2) irrelevant in regard's to OP's question, and even then, it still is, considering he asked why feminists want men to stop raping instead of women taking precautions, not your solutions as to how to do so, because according to him, teaching men to stop raping is delusional (which you just did).
I ignored the phrase you cannot prevent something you don't understand because it's irrelevant to my point. You obviously cannot prevent something you don't understand, 3) but doing so by portraying rapists as "normal people who do bad things aka make mistakes" is not the solution to understanding the issue and hence not the way of solving it.
4) Stop believing that your opinion is the only valid one.

Erm nope. I think you will find it's "Forcing another person to have sexual intercourse against their will"

Women can do that aswell.

Googled it and found that the 'research' was exclusively done in the US and the 'researchers' concede that the sample size limited the study.

No they can't lol. No matter what happens, the man will always experience pleasure.

1) Firstly, no it does not. That is an emotional stance you have taken. Not a logical one, therefore I'll be ignoring any more mention of it.

2) It's not irrelevant, you just don't seem to have understood.

3) And there in lies my reasoning on my first post, to help people understand that most rapists aren't evil psychopaths hiding in the bush, and to prevent rape we must first understand the rapist. In order to in the future teach men why this is wrong, for those who don't seem to understand. As for "but doing so by portraying rapists as "normal people who do bad things aka make mistakes" is not the solution to understanding the issue and hence not the way of solving it." I disagree.

4) Also I'm not interested in opinions. Only facts. And the FACT is, the majority of rapists are indeed "normal" people who have done a horrible thing. And the FACT is, we cannot prevent further offences without understanding why they raped in the first place. And we cannot instil morals into these men and teach them not to rape without understanding any of these factors.

Now you can get upset about that all you like, but honestly I don't care and it's nearing 3am so I'm going to sleep now anyway.

No they don't actually.

Rape is defined as penetration with a penis.

Plenty of people without mental health issues commit violent crime, and plenty of people with them (e.g. me) wouldn't hurt a fly.

Women rape men aswell like.

You did by saying that rapists were simply normal people who committed mistakes. When you do that, you're playing the "not as bad as they're made out to be" card, which trivializes rapists.
Not to mention, it is completely irrelevant in regards to OP's question, as he asked why we should teach men not to rape instead of teaching women to take precautions, not your opinion on why men rape, and trivalizing rapists by saying that they're normal people who made a few bad mistakes does not help the cause either, thank you though.