Compromise cannidates don’t work. They let the country go right with no benefit. You know which cannidate actually got lots of crossover votes from Republicans? Bernie Sanders
Sanders had the support of about 1/3 of the Democrats. You can’t get somebody like that to actually be the nominee unless you get the rest of the Democrats to support their policies.
he got screwed over by the party, twice. primary elections explicitly aren’t free and fair, legally