Parents protest outside school because of cartoon of Muhammad

I would point out the distinction between actual liberals and the queer American perversion of the term (meaning SJW leftist lunatic) two very different things

The teacher has been named on local social media and had to leave home and go into hiding under police protection.

Whilst there is a difference I don't think it's actually as big as you make out. They're two sides of the same coin albeit the left side is much more ugly than the right.

The only "Liberals" who as far as I'm aware have a coherent policy on this is geert Wilders and to a lesser extend Farage both of whom are considered apostates by both sjw/ and most "actual" liberals. That is, if you want a laissez-faire society and neoCon foreign policy it would probably be a good idea NOT to bring in tens of thousands of people that are very much against that.

(For the record I don't like or support Wilders)

In what way are either of the far/hard right wannabe autocrats liberal exactly? After all, ones opinion on markets is but one facet of liberalism.

The teacher has been named on local social media and had to leave home and go into hiding under police protection.

Yes, how awful for him and his young family of four children. Fancy having to put under police protection just for offending a few parents - the worst a teacher would normally expect would be a stern email from the Head. Thank Goodness the suspended teacher has been supported by the Department of Education, even if his own headteacher has fed him to the wolves to protect his own back (or head).

This is a clear case of islamophobia and incitement on the teacher's part. It is right that he should be sacked and face prosecution. This goes far beyond free speech and into the realms of hate speech. He knew that it would upset and offend his muslim pupils yet he did it anyway.

Freedom of expression is "extremism"

Of course it can be. What about preachers of Jihad; neo-Nazis, revolutionay Marxists?

I think the clear difference here it does not fall into the category of either hate speech or incitement.

I think I will wait for the inquiry.

You understand Catch 22; by claiming to be mad to avoid cambat, you prove your sanity.

You are exercising free speech if you don't claim to be exercising free speech but if you do claim to be exercising free speech, then it will almost certainly be an act of incitement.

One of the protesters outside the school has been quoted saying "We would not like any form of extremism, any extremist viewpoints, to be taught to children."

https://www.bbc.co.uk/news/uk-england-leeds-56523179

Freedom of expression is "extremism"

I think the clear difference here it does not fall into the category of either hate speech or incitement.

There won't be an inquiry, just as there was no inquiry into the homophobic protects outside Birmingham primary schools.

The teacher is suspended. There will have to be an inquiry.

I thought you meant proper inquiry like Grenfell is currently getting not just the school "investigating".