Liberals believe in the lesser of 2 evils when
if favors Democrats. But in 2016, they played
a different tune when it favored the Republican.
Do liberals have any value that's held in all
circumstances?
That's an over-broad claim, I think.
I'm a liberal. I live in Canada so I'm never really faced with a dichotomy as Americans are -- I don't get to vote for a Prime Minister (unless I live in his riding), as the leader of the party with the most seats will (usually) become PM. I have, in the past, voted for another party when I believed it was time for a change. Several years ago, in Ontario, I voted Conservative because it was absolutely time for the Liberals to be reduced to a rump, which they were. In the next election, all things being equal, my vote will return to a Liberal.
If I were American, however, and really had to choose between two people unfit for office -- knowing full-well, as we all do, that one of them (and nobody else) was going to win it -- then I would certainly vote for the one I considered the least unfit. That may be hard to determine, and my criteria may not be the same as someone else's, but that is exactly how I would proceed, because I would know that voting for a third-party candidate would not result in that candidate's election, and could very well end up allowing the least fit of the other two to squeak through. I would consider that a failure to vote intelligently on my part.