I personally find this view strange. I think there's tremendous risk in breeding a community that promotes this behavior to a degree that it's difficult to discern whether or not someone is _actually_ talking about shooting dozens of jews at a synagogue instead of _joking_ about it.
At some point in time I don't think it's worth picking apart that nuance anymore. Like, it's great they're not committing acts of terrorism daily and are instead only doing so every few weeks, I guess, but there's really no reason to defend the people who are promoting this behavior in order to protect the use of grade-school irony.