>I have one moral standard to which I hold myself and others: do no harm.
How do you define "harm"? What if one's view(s) prompt them to vote in favor of things (or support policies - take your pick) that bring harm to others?
Maybe exercise some humility instead of jumping to the conclusion that you are right and they are wrong? I'd take the opportunity to seek to understand how someone living in the same world as you, with access to the same facts, and the same mental faculties, how such a person has come to a different conclusion about what does harm.
How do you define "harm"? What if one's view(s) prompt them to vote in favor of things (or support policies - take your pick) that bring harm to others?