Because Trump's tariff idea is one of the dumbest ideas you can imagine. And if he goes through with it, it'll be devastating. This is only the beginning.
The point of tariffs IS to raise prices. That is how they work. Using tariffs properly means picking a very specific industry, putting up a tariff and then potentially subsidizing the industry to some degree at home. This means the people in that industry at home can offer the product at a lower price, while those outside of the country can never keep up with that price because of the tariffs. And so you can grow a domestic industry, even if it would otherwise not be viable.
Tariffs are mostly a tool for developing countries, or something for key strategic industries, such as microchips.
They are also very risky because, for example, they can cause trade wars and retaliation and all other sorts of instability. And that's when they're used well.
Tariffs across the board make no sense. There just aren't enough people in the United States working at a low enough price to produce ALL of the things that Americans normally import. This means a drop in supply and higher prices. Potentially higher costs for American corporations too since the things they have to import to make their own products now cost more.
Trump doesn't understand anything about the economy. He's a complete moron.
Best everyone can hope for is that he doesn't actually end up doing it, or does a significantly lesser more targetted version of it. But as you, in this post, demonstrate the threat of it is damaging in itself.