[reposted from Facebook]
The other thing about Trump refusing to state that he will accept the results of the election is that it is an admission that he has abandoned all hope of actually winning.
It is such an obscene statement that it is going to contribute to getting out the vote for Clinton from people who otherwise wouldn't have come out. It also creates a disincentive for his supporters to come out and vote: if the system is rigged against him and he's bound to lose, why waste your time voting for him? Both of those things increase his likelihood of losing.
It's another reason why I think destabilizing the country, rather than becoming President or even making up excuses for his loss, has become his actual goal. If he was just trying to protect his ego, he could have spun his likely impending defeat in a way that actually might improve his chances of winning ("Crooked Hillary and the liberal media are trying to steal the country from us. If you want to stop them, get out and vote for me!")
It's really borderline nihilism. He no longer thinks he can win. He doesn't care about winning anymore. He doesn't care about his supporters (or that they desperately want him to win). He just wants to pour the gasoline, light the match and watch it all burn.