Lefties are routinely under the impression that their worldview is 100% right and moral, and anyone who thinks anything else is ignoring reality. It is not possible that they are wrong, and that the people supporting their enemy view them as making shit up as casus beli. It is understandable why your 'friends' are behaving this way.

I will armchair psychoanalyze them as being stuck in that mental development stage where Presence of Mind appears and you learn that other people can know things you don't.