I do not kill companions just because I disagree with them about ethics (or anything else, really). It's their life to live, not mine (man, how often did I use that sentence in RL debates lately). If they did something I can't tolerate, I'd still prefer to go separate ways rather than kill them.
Having said that, if things turn out, by the way I navigate the plot, that we end up on opposite sides, then that's too bad. I'd like to come to know Minthara, but since I won't side with the goblins as a rule she'll likely end up dead almost every time.
Everyone else, I hope to keep alive.
Even Astarion? He's a bloody vampire spawn ... which means he's evil and rotten to the core with no redeeming features whatsoever. Allowing such an abomination to exist is unthinkable.
Its even worst. He's an evil kinky snarky comedy relief monty python vampire spawn. I cannot comprehend the appeal to such companion. Jan Jansen is 10 folds more appealing.
If you give him the necromancy of thay it commands him to killthe party but he resists it. Calling him evil misses the mark.
