It's clear that you've thought about this, so what do you suggest is the appropriate way to have a constructive conversation with someone who openly endorses at

It's clear that you've thought about this, so what do you suggest is the appropriate way to have a constructive conversation with someone who openly endorses atrocities? The pro-atrocity side is welcome to describe the crimes they support in warm, fuzzy terms that do not offend those with delicate sensibilities, but the anti-atrocity side cannot even freely state their case because it naturally involves invoking the truth of horrific events. Are we bound to stay silent about such actions because those who support them may be offended by being associated with their plainly factual content?