I know the Hitler thing is called Godwin's Law.
What is it called when somebody brings up the (500-1,000 year old) Crusades about an issue in 2016?
Especially when they don't actually KNOW history, just the bleeding heart talking points version. Muslims DID murder and rob Christian pilgrims trying to reach Jerusalem(which the muslims had claimed as their own holy site and limited access to by the Christians in the first place. So, trying to defend islam as simply fighting back against the "evils" of the crusaders is still bull **** in every possible way.