I'm going to post this first; I think one point of confusion is that I see the term "harm reduction" originating from the "both sides same" people. They use it to say "it's only harm reduction, it's still harm, therefore I won't vote for it". Or "Dems only reduce harm, not help, therefore I won't vote for them". Don't let them fall into that trap of what's basically both sides same.
If a person is anti-dem, there's no way you'll convert them with logical arguments.
That's part of the problem with trying to argue "harm reduction". You'll never convince them trying to argue "harm reduction". It plays right into what they want: to portray Dems as harm, just harm lite. That's what they want, for you to call it harm reduction, which is harm lite, which is on the same side as harm, which they won't vote for.
For the rest of this message, you've fallen for their trick. I started to elaborate but I'm going to cut it off there.