Democratic Primaries

What is the priority, getting rid of Trump or fulfilling Bernie's internal motivations? Every Bernie supporter must answer this, in light of the following 2 data points (which admittedly I've seen posted on DU and provisionally accepted as plausible, but have not personally investigated myself):
1) to win the nomination on the the first ballot, Bernie needs a 10% margin of victory in each remaining state, or the equivalent.
2) Bernie is not projected (by 538) to win a majority in any of the remaining states.

So what's the point? Bernie and his supporters will say advancing various policy points.... Sounds good on the surface. What is the COST? Disillusioning Bernie supporters from Biden by repetition over time, encouraging them to sit out the general because their guy didn't get the nomination. That path leads to 4 more years of Trump, and a generational, multi-generational, or permanent deviation of reality from the ideals which Bernie claims to aspire to.

If Bernie wants any Americans, ever, to experience the ideals he espouses, his best chance is to do everything to remove Trump in favor of Biden first, and second do everything he can to move winning-Biden towards his personal agenda/ideals.

But that means subsuming "Bernie" to "Bernie's ideas done in another person's name." Can or will he do that?