Democratic Primaries

Dems only number roughly 33% of the entire electorate, so 1/3 of Bernie's 30% he's averaging in the Dem primaries is only just 10% of all voters. If 15% of that are asshole anarchists that's only a mere 1.5%. Probably even less than that in far less progressive swing states where Bernie may have even less support than 30% of all Dems.

Doubt that is enough to cost Biden a single state Hillary won in 2016. Might conceivably cost us a swing state or two that Joe coulda won but even if they do defect mainstream Dem voters will likely show up in hordes and Indies will most likely swing Biden's way as well.

These most ardent Sanders supporters sure do like to give off the impression that their numbers are far higher than they really are. Squeaky wheels.