I agree it has done in the past and I've reported it when it has and shall continue to do so.
But Damocles is right, it's not just this forum, the amount of shit I've seen posted on Facebook after such events by what I would have considered normal, middle class, hard working people. Sharing Britain First bollocks and such like. I just use it as an opportunity to prune my friends list now as replying in kind just gets into a huge argument, one of which ended in me being called a camel shagger. Society in general has a new bogey man and those that are hard of thinking have no understanding that IS don't stand for all of Islam. Islam is some foreign thing to them, led by guys cutting people's heads off and/or hooks as hands. Happily that view couldn't be further from the truth and Islamic hospitality is amazing. But without getting further off topic, I'll just repeat, it's easier to report the posts that attack Muslims as a whole than engage, as it's unlikely you'll be able to change a closed mind.