I wholeheartedly agree the Church should denounce the alt-right. It could be awkward, considering the bishops tacitly and not-so-tacitly supported Trump. Still, it would be the right thing to do.

One reason extreme ideologies attract young men is that (many) young men are naturally aggressive and at loose ends and just want to kick some @ss. Also, men are extremely sensitive to perceptions of humiliation. Classic example: the president of the United States. Religion and politics make violence meaningful.

Look at these types who drive trucks or open fire on crowds. They don't tend to be very religious. Rather, they reach for some glorious excuse to vent their rage.