Yes, they’ll all speak out. This one is too easy...even for them.
Maybe you're right. However, it's a good bet that they'll slam all religion, and speak of the evils of ‘religious fanaticism’, rather than to direct this wholly toward Islam. I think the idea that the left will ever be convinced by facts or argument that they are wrong, about anything, is a non-starter. They are the self-convinced. They are the intellectually and morally superior. Of this they are certain. In addition, there is a great deal of hatred on the left, not much different than that which fuels the zealots who persecute others in the Middle East.