> My point is is that if leftists cannot talk about immigration policy in a nuanced way

Does nuance mean agreeing to your framing of a situation? If so, I guess not. That's not what it means to me.

> a naive idealist

Insults aren't helping your case.

> associate the effects of a bad policy with the policy itself.

What are the effects you're referring to here?

> Humans see patterns in everything, that's how we work.

Here's a pattern I see: American-owned propaganda networks take over Canadian news and trying to drum up racist sentiment and lots of people falling for it.