There are some serious crazies in the settler population.
There are some serious crazies in Cleveland, Pittsburgh and Dallas as well. I don't think that you can generalize the actions of one man to the hundreds of thousands of Jews who live peacefully in those areas.
Also, remember that we don't even know who the shooter is or whether this was a terrorist attack. Initial reports said that it stemmed from an argument on a bus.
"There are some serious crazies in the settler population."
And just where does the "settler population" come from?