Imagine taking as many steroids as Jeff Bezos has taken, only to end up being afraid of an obese elderly man who cheats at golf. What was the point of all that flexing?
On a serious note, this is an example of what historian Timothy Snyder refers to as "obeying in advance", where people predict what a repressive government will want and then obey before they're in power just to be safe. This creates a positive feedback loop that leads to them seizing power.
Well, he does have a reasonable chance to be elected to presidency, so there's that.
Morality and general spinelessness aside, it's clearly the sensible thing to do. You might anger a few sensible people but that will pass. Trump is not exactly known to be forgiving. Remember when he refused emergency aid to states that weren't supportive enough of him? That's the sort of decrepit small-minded snowflake we're talking about.