The problem with Trudeau is he was highly intelligent but not all that smart. He was a big picture guy. And big picture guys don't want to hear about niggling little details, like, you know, how the hell we were going to pay for the big picture. He basically started the debt, and double digit inflation did most of the rest during Mulroney's time in office.
Mulroney, on the other hand, tripled immigration for political purposes, the results of which we see today.