I do not agree with Scooby's sky is falling viewpoint and never have. He seems to see it as keeping up a high state of alert so we don't become complacent. I see it as risking defeatism, which as you said plays right into the bully's hands.
There is a difference between saying "that's a dumb idea" and "you're dumb." God knows I violate the distinction all the time when I'm angry, as you've gotten my goat enough times to know. But, you know, the world's at stake. We are fighting actual Nazis. We have to win. So let's try to treat each other with more respect even when we disagree. We can all stab each other in the face after Inauguration Day.