Among other things, "other people" are not running for President of the United States of America.
With Hillary, yeah, you could say "so what if she's corrupt as shit and lies through her teeth? Don't all politicians do that?" And I think most politicians today are at least somewhat like that, but I feel that she's worse than average, at least worse than average among Democrats. But still, if nobody better were running, sure, she might be the least of all evils and many people would overlook that, well, cause she's a Democrat with a capital D (it worked for Bill). And she's a Woman, too, and don't we all want to elect the first female president, regardless of who she is?
But actually, all of her scandals and the awkward things she says (to put it very politely, I really mean the incessant stream of bald-faced lies) are sort of never-ending, with another scandal or mis-statement right around the corner seemingly daily, and are signs of a much deeper problem. And that problem is the whole reason why so many people are so thoroughly disgusted with politics and the entire American political system in the first place. Therefore, since they're trying to change that oligarchic, plutocratic, corporatistic, corrupt, war-oriented system of power and money that's taken away our democracy and ignored the voters (aside from lying to them to try to get votes), and since she's the shining example of everything that is wrong with that system, why would they want to vote for her? Why would they refrain from calling out her corruption and lies every time they see them?