I presume you to be joking, but seriously, that is a massive abuse of the old "aliens don't count" rule. I mean, it's openly established that many of Voss' servants are both sentient and unwilling. Tempest and the Adept must have had some awkward silences over dinner.
And I'm not saying that the killing heroes are just randomly murdering people left and right like Iron Legacy. Well, except Expatriette. She is clearly a 90s hero, from an era when even Optimus Prime would gun down surrendering enemies. I imagine that Expatriette was created with a similar attitude, and after the tone of comics shifted again, people just tactfully didn't mention her hundreds of barely-justified murders (see also: Cable), while she contented herself with killing the occasional D-List villain or semi-named mook during teamups, and may or may not have had a more violent - but still less so than in the 90s - solo book (see also: The Punisher).
As for the other two, Chrono-Ranger is mostly notable for enigmatically showing up to destroy something very non-human, which almost nobody would object to, such as Akash-Bhuta or the Loch Ness Monster. However, we know that Con has instructed him to kill at least one human "on sight," so I would guess that while he doesn't do it often, he has killed a (very bad, and known to cause big problems if left alive) human or two. Eventually, other heroes must have seen him do this, and gotten very angry. Whether any given hero would accept Chrono-Ranger's reasons for doing it would be a great character study.
Then Fanatic. In this case, I will admit that my evidence is sketchiest, since all we have is some brutal-looking art, and a secondhand account of her killing some (sentient) aliens. But my take is that she usually responds to sinners with fire-and-brimstone speeches, augmented by the Laser Beams of Chastisement (no, seriously, what exactly is she doing in Brutal Censure?), but really bad ones get dropped from great heights instead. Once again, other heroes are probably uneasy about this, and since I assume she is both more open and more frequent with her killing of people, they might view her as just another villain... if she were operating in the United States. However, my read is that Fanatic is still operating out of Lima, which has some troubling trends of police corruption, so on her first visit to the inevitable core of a superhero universe which is the USA, she could be narrowly stopped from killing some total scumbag (probably by Legacy, though in my group's play, it wound up being Bunker instead) and after explaining herself, would reach a reluctant agreement with the Freedom Variable that they would support her as long as she didn't go to far, and she wouldn't kill people on their "turf" (or anywhere with functioning law and order).
Ironic
P.S. It just occured to me that Fanatic might concievably be a product of the 90s, too - openly theology-based heroes were thin on the ground, before Spawn and Dawn and so forth in that era.