Angry Atheists and Anti-Theists

[Duty]

I question the motivation behind some atheists. There is a lot of anti theist openly attacking theists. Why? 
And why are they all so angry?

Check out this guy… Why is he so emotional? Where is all this anger and hate coming from???
Is his anger justified? Why? Is this guys argument even logical?

https://www.youtube.com/watch?v=FoIo_FUj408

Thanks for reminding me I should be more angry at theists (especially evangelical theists) - I've been slacking off on that recently. Let's see - reasons to be angry at, say, Christianity - well, for starters, there's....no, too tired, it's late. Perhaps you can guess some of the things I'll list when I get back to this one tomorrow.