Not at all. It's necessary to protect your own industry.

If Canada didn't impose tariffs on US dairy, Canadian dairy farmers couldn't afford to compete against US subsidized Dairy. And it's quite important for a nation to maintain its own food production.

International trade is complicated. I say US here but almost everyone put tarrifs on Chinese EVs. Germany's economy for example heavily relies on the auto industry, and a collapse could mean a lot of problems.

You also don't want a monopoly. If China are the only one's selling cars, it won't be long before they are no longer cheap. We speak of cars but it's the same for food. You don't want a foreign country to have an economic handle on your food.

It's also worth noting that these other products are often cheaper because the people making them have a lower quality of life. We don't want to end up in a race to the bottom.