tariffs can be used for a lot of things, unfair practices are one, just like taxes they can and should be used proportionally to discourage undesired behavior, such as buying foreign goods over local.
Since tariffs should never be lifted I dont see much relevance in discussing the effects of lifting them.
Like taxes tarrifs can of course be used to target things unfairly. The assumption with any tool is that it in order for it to benefit society it must be used properly, and that means not using it to target the wrong sorts of companies or resources.