The rules have never been the one who gets closest wins. Trump supporters should be upset with him because he refuses to play the game as it is set before him. Instead he whines and complains that Trump is “stealing” delegates. If Trump can’t win at politics, he will never be able to be an effective president.
That’s the problem. You shouldn’t have to be a “politician” and play political games to win. We should be a citizen government. If Trump wins with the people he should win.
Also- if a politician can’t win with the people, they should not be President.