I respect what you're saying, but I still think that if someone's values will do more harm than good, some introspective is needed. Extreme example, but gangs are groups of like-minded people with strong similar values, and that's not always a good thing. If they vote in politicians that are favorable to them, bit of a problem.
If my values cause more harm than good, they might be bad values, and I expect someone to tell me as much. Doesn't mean I'll like it, it's an attack to my core. But tell me why you think so, and I'll listen. If I can understand how my values do harm, screw em, I'll change em.
Now sit on the other side of the table.
“Killing a life for any reason is causing harm and wrong. So ‘your’ law about allowing people to do that is unjust and I could never support it.”