> By definition, tariffs (wherever they are) are always self inflicted harm on the opposite of a libertarian ideology where as cutting a contract because you don't like the company is exactly that.

That doesn't mean it is not a "self inflicted harm" in essentially the same way, it just means you believe you have some justification that outweighs the harm. But there is no reason why you couldn't justify tariffs in some way (e.g., because you don't like the country).