Maybe try asking them nicely first, or putting up a sign that doesn’t have a threat in it? Like, I get it, someone slighted you so you got to make them think twice before crossing you again, but going straight to building a trap with razor blades is a bit extreme and will probably land you before a judge.
I have a gut feeling that his talk of tariffs is a bluff. Even if it’s not my gut still tells me there’s going to be exceptions for certain things that are big money makers for Trump and his allies. Trump’s administration is not going to tax themselves unless they can provide a loophole to get themselves out of it. Ultimately it’s the consumer who pays for tariffs, but they’re entire purpose is to slow down trade and if that costs Trump and his allies too much of their wealth it won’t happen.
Trump is as predictable as he is unpredictable because he doesn’t stay consistent. He changes what he says and does to be perceived as best he can in that moment. Which makes understanding his actions a little easier, his past actions are irrelevant to his future decisions, it’s just about what’s in his head in the moment. Which is just a lot of words to say that Trump, his administration, and his allies are just chaos, and you never really know what chaos will bring except a change in the status quo. It’s not looking optimistic though.