Dank, you don't know if Sanders would have lost. No one will ever know. All you have is the certainty of your opinion. I remember well what the opinions were of Trump becoming president the day he announced and I knew he would win at least the Republican nomination. One in perhaps thousands thought as I did, but I was right and my opinion was that only Sanders would be able to beat him. If you find a problem with the analogy you chose about battered women, pick one that isn't flawed. The fact of worldwide movement to more liberal thinking is documented. Attitude, my friend, has emotional repercussions. You give up in the face of disappointment. You allow that to color your world view. All hate is self hate.
If you or I can't somebody else will.