We have a first pass the post voting system which only allows for two parties.

We have this thing called the electoral college that further obfuscates the popular will.

Both of these flawed systems disillusion millions of people every election cycle. People in non-swing states who have a minority opinion feel they have no voice, and often do not vote.

People who have serious issue with the two major parties have no viable method to express their political will.

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Media:

We have a highly polarized media environment where a large number of people only get their facts from highly biased sources. This can happen on "both sides" but it's particularly evident with conservative media such as Fox News. In this outlet, millions of people see an alternate reality to the one we live in. They don't see Trump's age-addled brain or his most offensive rhetoric.

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Policy:

Many people seem to think that the Democratic party is responsible for the inflation of the past 4 years. Many people seem to think that Trump stands for lower taxes for the working class, in ways that won't hurt them.

If we take Trump literally, he wants to deport many millions of people who live and work in this country peacefully, but do not have proper documentation. He wants to give Ukraine to Russia. I believe he is at best ambivalent to a national abortion ban. He doesn't show any support for combating climate change.

I'm probably leaving some points out, it's late.