Trump didn't invent anything, concern about Islam has been a major issue since 9/11 and all the terrorist attacks in Europe, Trump only articulated publicly the existing concern, and that for over a year of campaigning, so the only new development that could account for setting off Bissonnette is Trudeau's invitation to all the Muslims refused by Trump to come to Canada, the day before Bissonnette acted. 

And I disagree that Parizeau was persona non grata in Quebec or the PQ. There was general disapproval of his disgraceful drunken behavior the night of the election, and resentment that this behavior reflected badly on separatists, the PQ, and Quebec, so a desire to distance themselves from that, but most francophones understood perfectly well what he meant and did not let one tragic mistake in judgement overshadow his overall stature as a statesman who did a lot for Quebec.