Going off on your own political party members is really smart! Attacking them for not supporting you..for breaking a "pledge". What does he expect to gain by attacking his own kind? HOW?

So far Trump is the POSTER CHILD of what not to do.  Ronald Reagan said to never attack members of your own party. Trump attacks them as if they were competitors for prez. Calling attention to each one who doesn't want him. Isn't he making a bad situation worse? Shouldn't he just shut up and stop complaining about and attacking those he will have to work with if he is prez? Is he that shortsighted that he doesn't realize he is making things a lot worse for himself this way?. Why don't his advisors advise him of that? Since he isn't smart enough to realize it what does he pay them for and why aren't they doing it?