I wouldn't say all but broadly yes Canadian markets should be more open to US producers/companies.

I do think it is perfectly reasonable for any and all nations to protect and preserve critical domestic industries (whatever that may be deemed to be, food production, energy, minerals, medical supplies, building materials). It's not always a good strategy to rely on the kindness of strangers in crisis.

I am not against the US putting tariffs on imports of what they deem to be critical for American stability and security.

The reality is when you agree to something and then try to take it away there will be anger and push back. I am not making a case for or against the tariffs, I am just telling you how it is being interpreted in Canada and that it shouldn't just be brushed off as Canadians just hate Trump.