

We got to vote for Bernie in the primary. Not enough people chose him over the “safer”, more conservative Biden (who definitely wasn’t advertised as having the same policies as Bernie). Biden was still way better than Trump, so we should have voted for him in the general. This isn’t complicated.

It’s hard enough to get voters to turn out for their own primaries. People don’t strategically vote in the opposition primary in significant numbers; that’s pure fantasy.
What South Carolina has, in addition to a lot of Republicans, is a lot of conservative, risk-averse, black Democrats. They don’t vote for progressives in primaries, because they believe (probably correctly) that white people won’t elect them in the general. That’s who nominated Biden.