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As for the real world, there is a large variety of tariff policies around the world, and most countries implement much harsher tariffs than what Mr Trump is suggesting for America. There are many very good arguments for tariffs and against tariffs, let's talk about them instead?Sorry, no. This is a common Trumpist talking point that has validated the comment you're responding to.
Every aspect of the US economy is currently wholly reliant on imports. Untangling would certainly be possible, but would require an intelligent fine-grained approach with deliberate analysis and substitution - not ham-fisted blanket import taxes. There is absolutely no sense to any of Trump's actual policies, nor the manner in which they're haphazardly announced and then constantly churned, unless the goal is simply to harm our country.
Debating and critiquing as if these might be good faith attempts at helping our country is a waste of energy that needs to be used more productively. Trumpism/destructionism thrives on our desire for rational debate, because while we debate how to build they just destroy. At this point, regardless of your political persuasion (I'm libertarian), it's time to stop drinking the Kool-aid and wake up to the fact we have a malevolent attacker in the White House. We can go back to debating the finer points of policy after we have an administration that actually puts the interests of the United States first.