The difference is the I can't do anything to change the actions of the Past (I never supported the Iraq war.  I did my best to humiliate Democratic candidatesn- who 'authorized' Pres Bush to conduct the war - during the Iowa primaries).   I can vote for the Future of our nation.   Trump has neither the personal values or the professional skills that I would expect in the President of the United States.

Each may vote as they please.    I will not vote for Trump.  I've not hidden that fact from anybody.