"I do not support this man but I did want him to be President, and cast my ballot for him" is a concept I can't understand at least.
When you have such a limited number of options their isn’t an obvious reason for the choice. Both loving A or hating B more than you hate A can result in an A vote. With millions of voters some people are going to vote based on silly crap like a candidates name being similar to someone they know, or a coin flip. Hell, you can expect at least a few mistakes.
PS: 1,865,620 people voted libertarian, presumably a few felt the way you do but when you know someone isn’t getting elected that opens up even more options.
To kind of latch onto what you said, I'd say that there is 60% of those 74 million who would have benefited from a Twitter ban which was well justified. They are more on the fence and can be persuaded by the tides of big business and what seems like an over reaction on their part. The 40% are probably hopelessly convinced of anything that Republicans say.
However, mostly it’s based on party affiliation where people voting against him in a primary would vote for him in a general election.