It’s the difference between being in a burning building and being the same burning building while people throwing Molotov cocktails through the windows.
Both are dangerous but one is worse.
In this case if you pick just the burning building then the group keeping you in that building are saying “we can’t let you out of there but you better support us or the guys with the molotovs will show up”
I understand that logically you’d pick option A but would you have enthusiastic support for the people keeping you trapped in the building?
Candidates have to get people motivated to vote and “we won’t do better but the other guy will do worse” is not motivating enough. We saw how that plays out yesterday