I was flipping through Thunderbolts #171 and I started wondering whether Songbird killed this guy.
It seems pretty cut-and-dried that she left Doctor Dorcas to die after allowing his monsters to attack him. But Dorcas had already escaped death before by turning into a human starfish. I’m not even sure he can be killed.
Kei, though, actually comes across as more monstrous because he’s just a regular guy. You could meet a man like Kei in real life, which makes it more upsetting to learn that he was capable of being paid to sleep with Songbird as part of a ruse to kidnap her. So I think Melissa would be justified in killing him. He’s committed some very heinous crimes, there might not be enough evidence for a trial, and on top of all of that he betrayed her personally.
On the other hand, Songbird said way back in T-bolts #14 that she’d never killed anyone, and there’s no sign of that changing by #171. If anything, her ethics on that subject would only be stronger after being trained by Hawkeye and then training other Thunderbolts herself. So when she had no code against killing she also never had a reason to kill, but now that she has a very good reason she’s bound by a very strong code. That’s an interesting dilemma, but it can only stay interesting while Kei is breathing and Melissa has both options on the table.