On the other hand, many of the people that voted for Bernie only voted for him because they hated Clinton and/or the wider Dem establishment, not because they supported his policies.

Many people who were going to vote for Bernie ended up voting for Trump.

I don’t think that’s true. I don’t see how anyone who saw themselves as principled supporters of Sanders could ever vote for Trump, they’re diametrically opposed. They share nothing in common. The only people who voted that way weren’t serious to begin with.