I thank you for sharing your thoughts. Let me put it to you this way then. Imagine a world where you do not engage with that person and they continue living their life furthering the cause you so despise. Now imagine a world where you do engage with this person and, just maybe, you manage to change their mind. Which one of those two worlds do you think are better of?

I understand there are some people out there who believe in vile doctrines, but the way to change a person is to continue treating them with respect, even in the face of their hatred. Eventually, they will begin to question their behaviour and feel guilt about the way they are treating you when you do not reciprocate.

I don't know. It's just the way I see it.