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His being a transgressive monster is well known and also the primary source of his appeal. I think pointing out his amorality alone won't help. However, perhaps linking his amorality to how he will personally hurt voters by harming women and LGBTQ+ rights and by destroying social security might land. He might say he won't do that and the retort would be he is lying. A monster is only appealing when he will attack the right people and not you personally.
A monster is only appealing if they act and believe like the supporters wish to be.
And it's also the power of never taking responsibility for monstrous things in this world. If the monster is given power to do monstrous things, if you support monstrous things then you can watch it all happen. If the monster is stopped and punished, but you had supported the monster, you can stand aside and say you were never part of it.
The monster is only a small part of how monstrous society can be.