(Original post by Willez)
I think you need to take a good read of Machiavelli's The Prince
. If countries were to abolish armed forces - indeed, even if every country in the world were to do so, what's to stop independent groups becoming mercenaries? What's to stop the actual armed thugs--not the soldiers, mind you--from placing themselves in the position previously occupied by professional men willing to lay down their lives for their country?
I don't think you've thought this out. A system like you dream of will never exist and can never exist. There will always be a way to attack another nation, even if it weren't through armed forces. And what of the problems that having mercenaries would create rather than soldiers? Thought of the fundamental difference? Whereas a country's soldiers has signed up for what he believes to be his land, his home, and is willing to get himself killed for it, a mercenary is not the same. They do it for the coin, and for whatever doesn't threaten their lives too much. Machiavelli addresses this quite aptly; "if any one supports his state by the arms of mercenaries, he will never stand firm or sure, as they are disunited, ambitious, without discipline, faithless, bold amongst friends, cowardly amongst enemies... in peace you are despoiled by them, and in war by the enemy". Read Chapter XII. I won't bother quoting everything he says which invalidates your argument.
Simply put, OP, if all armed forces of every country were to be abolished, each country then becomes vulnerable. There is no such thing as safety in mutual vulnerability, because mutual vulnerability will never exist. People will only see a lucrative market in which a demand for mercenaries is high, because honestly: if there's nothing to stop an enemy, why would they wait for you to find a way to even the fight? From every stand point, a country will simply see having mercenaries as an advantage. And then we'd have war again, except this time will all the weaknesses and uselessness of men working for the highest bidder.
Your proposal is like saying that we should be in anarchy because the government can't solve all our problems. The world works not by finding the perfect solution. It works by finding the solution with the least problems.