"someone voting for the "least worst candidate" does not wholly endorse everything they stand for"
yes but somebody voting for the "most worst candidate" is not somebody who's values should be trusted
yes but somebody voting for the "most worst candidate" is not somebody who's values should be trusted
with direct discussion about values, it's possible
basically all comes down to "are you open to the chance you're wrong"
you could view that chance as low as 0.001%, but it shouldn't be 0
If they engage with politics as tribalism, and you talk to them about a policy their tribe implemented that conflicts with their values, this is useful.