Fascism is the problem. Trump is a very notable symptom, but many others are also to blame for the fascism issue, including some democrats. I believe this fixation with Trump is due to people wanting simple answers to complex problems.
The fixation is because there is no clear line of succession. If he fails, who steps in? They'll splinter and fragment. They'll still be deplorable, but less effective when not united behind a single authoritarian leader.
Democrats aren't authoritarians. It's a bad comparison. Democrats are always fragmented, it's virtually a defining characteristic. Post-Biden unity has been quite unusual.