It's not "wrong" for an imposter to kill a crewmate because that's how they play.
This analogy is specifically from the perspective of crewmates. It is wrong for crewmates to die, actually, because this brings your team closer to defeat.
I think you might also think that I view the crewmates as women? No. The divide drawn here is between cooperative and uncooperative. Citizen and villain. The presence of imposters makes all crewmates less safe to be around. Unless you have ways of managing risk.
So it would be like green crewmates assuming a red crewmate is an imposter on the basis of them being red,
If the game were programmed such that red crewmates were exclusively the ones chosen to be imposters, regardless of how this might damage the video game's fun, don't you think that being near a red crew member would set off some alarm bells? Wouldn't you think of green crew members as more safe?
I've played plenty of RPGs where certain kinds of treasure chest, and certain kinds of treasure chest alone, require a degree of caution because I cannot know if they are mimics.