I mean, there's absolutely bloody nobody that I will be happy about voting for, it's going to be the least worst option.
Yes!
You're not being asked to "support" them, provide a character reference, or marry them.
You just have to chose the best / least-worst among alternatives.
Saying "X is icky" in isolation is not helpful - you have to say why Y is better than X.
Concrete facts that might make people regard a particular candidate as totally unsuitable as a person regardless of stated policies and are worth presenting, but I'm not seeing them.
And one side note - it's a parliamentary system with regional lists. You're not voting for Salmond unless you're voting Alba in the region he's standing in.