It isn't as bad up here as in America because we haven't yet devolved into a two party system but it feels inevitable with our election system. When you attack a political opponent you damage them and yourself - it never looks good to be focused on picking apart an opponent instead of boosting yourself... in a multi-party system this means that you're helping someone else more whenever you're running attack ads. Trudeau fear mongering about the CPC helps boost the NDP more than the LPC.
When you have a two party system that effect is removed. Both Trump and Biden are primarily running on how awful the other dude is without being held to account on their own policy stances... one of them is clearly worse but it's a deeply unhealthy political system.
(Just as an FYI, I'm a Canadian immigrant from the US - I'm now a citizen and I've experienced both systems).