A good many of these people are just perpetually angry. I remember as clear as a bell how even when Reagan was POTUS, the 'perpetual whiners' were as unhappy as ever and never stopped complaining, griping, carping, ...
Little do some of these people realize that when they are always hyperventilating and negative and angry about everything, NO ONE LISTENS TO THEM ANYMORE!
Everything you said is probably true, but it is hard to deny that there are many loyal Conservatives and Republicans who have legitimate gripes over a few important issues.