As far as I can tell, people who claim the former are almost overwhelming the ones voting for the people who are worst about stuff like this. I've honestly never seen anyone claim the latter though, so if that's what you believe, elaborating more would be helpful.
I'm surprised that you've never encountered this persepective before, it seems a very common one to me.
The first thing I think about is the South Park episode in which the elementary school had to vote for a school mascot and they were given the choice of either "a giant douche" or "a turd sandwich".
The second thing is another South Park episode (circa 2009), for which they actually produced two episodes (and aired one) for the Presidential election between McCain and Obama. Regardless of who would win, the plot was the same: the winner colludes with the loser in a National Treasure-style heist, with the election just being part of the setup.
In the latter example, the message seems to be that it doesn't matter who wins because the same outcomes occur. The former example probably doesn't need explaining.
Anyway, yeah, it would be nice to choose something better than a turd sandwich but when the other option is a giant douche, what is there to do? The way I see it, you either vote for someone who you know stands no chance (Jill Stein, btw), don't vote at all, or vote for the turd sandwich (or the giant douche, if that's your persuasion).
Bernie Sanders (prevented from winning the primary via unelected superdelegates)
Ross Perot (suddenly withdrew under murky circumstances and later claimed his family was threatened)
Both wanted significant change, although they were reformists rather than revolutionaries.