Hillary was a horrible candidate and probably the only candidate that could lose to Trump. Although I would say that Bernie would have maybe lost too beccause Americans weren't ready for social change. Hillary was the Dem party's dying grasp of holding up the establishment and the consequent 'rip off' of the working class.
Perverted and senile are exaggerations but there's little doubt that he was a poor candidate too. Only just barely preferable to the psychopath Trump.
Fwiw, I think that Trump won't run, but for some reason that won't be his choice. He poses far too much danger to America and it's democracy. His plan for a fascist takeover would require the military on his side and that doesn't appear to be even close to possible. That means that those in control of the military would almost certainly take measures to stop him.
When Trump is gone, America and the R party would make it's way back to normal. The military has a lot at stake to make that happen.
Rogan and Harris did a utube hour long discussion on Trump mostly but also a bit on Hillary about 5 years ago. It explains a lot of what you might be interested in hearing. It's the one where Sam Harris twice predicted a pandemic. If you have an interest and can't find it, I will for you if you ask.