What the other 99,999,999 other people do is irrelevant. But most people don't think that way. We must base our actions on reasonable, not outlandish, expectations. Under the circumstances outlined, few people are going to do any real homework on the candidates. There are other reasons why no effort would be rewarded.
Candidates often say one thing in a campaign and do something else once they get elected.
There's no contract you can try to enforce if they fail to keep their word. The word of a politician is as good as fool's gold, and people know it. That is why politicians have long been the favorite butt of jokes in America. But Americans are of two minds about politicians. They love mocking them.