I said some of them might be open to discussion. Plenty of them are probably just in it out of greed or sadism or because it's the easiest path to power. Trying to talk it over with them won't get you anywhere. There are people like that back on my world too, some of them with far more power than anyone like that should have.

[King Sombra and Queen Chrysalis come to mind.]

But if you can do it without placing yourself in too much danger, I still say it's worth the chance. I mean, when we did it with Discord we had the Elements at the ready to reseal him if necessary. Diplomacy is usually helped by a position of strength.