I would aggree with you that this "is just theatre" and as long as whoever is in charge is looking into the important stuff on economics and public policy, we could ignore the theatrics. I don't think this guy is doing a good job on the "important" stuff, but that's beyond me and I don't really have a say on tariffs, immigration or whatever else on someone else's country.
However, the "theatre" he does hurts real people in the real world. Trans people get killed or refused care, kids get shot in schools and even his own allies get hurt in the heat of the political theatre he creates. I must say I'm actually kind of glad he switched aim from vaccines to Tylenol: the whole antivax thing was extremely dangerous to the population as a whole, while blaming Tylenol will maybe hurt some pharma sales that's all. I wish he went with this discourse from the start, instead of spreading fear over vaccination during the times the World needed vaccines the most.
With that said, my whole point is that, unfortunatelly, political discourse has power, even if it's just theatrics. I wish you folks had more than two options in the US so you wouldn't need to choose his hateful and harmful discourse over the opposition, but sometimes you have to make do with what you have and it's not going to be good.