He'd have been arrested for saying it in the street, why should the fact he said it on facebook make a difference? Don't pretend that facebook is insignificant.

If World War 3 started I'm sure the UK would fighting for the good of the world and I'd probably volunteer rather than be drafted.
However I'm not going to fight for something I don't believe in and if that means the Governmemt puts me in the clink then so be it. That's the price I pay for my belief. I'm am not the Governments pawn.
Unless we are missing something.......dangerous precedent!
But what Mr Ahmed said might be illegal, therefore he has been arrested. Freedom of speech does not mean freedom from consequences.
What is free speech?
I do not agree with what you have to say, but I'll defend to the death your right to say it.
WW3 will probably be over fuel/money/power and being put in the clink probably wouldn't be an option, you'd most likely be forced to go as in tied up took to training and then tied up and took to war whether you screamed the house down protesting your beliefs or not.