The term "barbaric cultural practices" was indeed a bad choice of words, but not because it "perpetuates the bigoted connotation that all Muslims either practice or support female genital mutilation", it does not. 

It was a bad choice because it fuels emotional overreactions, always a bad idea on either side. The idea of a hotline, however, was not a bad one. We have hotlines for all kinds of social problems, why not one to help girls who might be struggling with the issue?

Trudeau was hardly the first to talk about "root causes", either. But there are root causes for Bissonnette as much as for Muslim radicalisation.