>Do you agree with countries doing the opposite to the US?

If their laws allow their leaders to enact tariffs then sure, they're welcome to do it. Foreign relations is complicated partially because countries operate differently. In the US, Congress is supposed to levy taxes and impose tariffs. Not the president. This game of nibbling (now chomping) at the edges of that clearly outlined role needs to end.

>When for example US tech is better than the local alternative but the countries create unfair advantages to the local alternatives?

We can still enact tariffs and similar policies. We have the same mechanisms they do. I don’t understand what is so “unfair.” Trump just seems to call everything he doesn’t like “unfair.”