No, I’d say it’s bad. They aren’t afraid of normal functioning people voting them out of office (which is a useful fear), they are afraid of being shot by lunatics. It is clear that the Democrats are already terrified of the most insane portions of the base, and are acting on their demands. That is not a useful sort of fear, it is destructive and corrosive.
And blown out of proportion. In the last 70 years only one Senator and two Congressmen have been shot while in office, and the Senator's injuries were due to a mugging gone wrong. They're creating a crisis where none exists, and if they're that afraid then don't run for office. Problem solved.