> electeds? primary threat?

I'm familiar with American and Swiss elections. In both, the principal threat to an incumbent is from an own-party challenger to their seat.

For an incumbent, particularly one in a comfortable seat, an opposition candidate is usually not an issue. But someone from inside the camp is annoying and requires rhetorical contorting and lots of spending, spending that can then leave one vulnerable to an otherwise-benign opposition candidate. (Also, motivated activists are annoying in the best way.)

A smart elected–in these systems–will thus take a call to defuse anger before it develops into organized activism.