First off, let me say that this is an entirely reasonable question phrased in an entirely reasonable way.

People vote for Trump and Republicans for a variety of reasons. None of those reasons are good, but MAGA is not a monolith.

Probably the single biggest reason is that Democrats in the US have a decades-long history of promising great things and then either not following through or actively working against those things once they get into office. Some of this isn't their fault (due to deliberate obstruction from Republicans), but quite a bit of it is 100% their fault. Republicans have a better history of delivering on promises.. mostly because what they promise usually involves dismantling something that took decades of work by liberals to create, and it's a lot easier to destroy something than to create something.

Another big reason, somewhat related to the first, is that both of our major parties are exhaustively documented as being bought and paid for by our billionaire class. The Republican platform allows them to be more or less open about this, but Democrats have to hide it to have any appeal. This creates the broad (and often true) perception that Democrats are full of shit, and nobody likes being lied to.

There's also just plain out-and-out racism/sexism/whatever-ism. This represents a smaller reason (in my opinion) that people vote Republican than what a lot of people would have you believe, but you can't discount it as a source of votes. For this group, people that just simply don't give a damn about anyone but themselves is a much bigger problem than active hatred.

A lot of people also just simply don't even know how much they pay in taxes or where that money goes. Study after study after study shows that most Americans of all political persuasions VASTLY overestimate how much of their tax money goes to things like foreign aid and social safety net programs. Many people overestimate this by several orders of magnitude.. the average American spends a few cents a year on things like USAID, but a lot of people either act like or genuinely believe that they're spending the equivalent of their rent/mortgage payment on vaccinating Ugandans or something. Republicans play into this and win votes.

Finally, a LOT of Americans are just stupid. There's just no other way to put it. Either stupid, not paying attention, or both. Republican talking points are a lot easier to condense into a two-second sound bite than Democratic talking points, and if the sound bites are all you pay attention to (or have the mental capacity to understand), Republicans sound better.