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, I didn't think you were making the crewmates just women. My point was, it's not morally wrong for the imposters to kill in the game, because unlike real life, the sides are diametrically opposed and all players want their opponents to earnestly try to win. Crewmates don't want imposters to just let them do tasks because then there would be no game. In that sense, killing crewmates is cooperating by making it a fun challenge for everyone. By the same token, it's not morally wrong for crewmates to make accusations against people in meetings or otherwise treat them suspiciously, it's how everyone wants others to play. But the moral weight to accusations in real life means it's not ok to make them casually. There is a burden of proof to overcome.

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 don't know where you are going with this. I guess my level of caution would depend on frequency of imposters. If half of red crewmates were imposters, sure. If it's 1 in 1000, I wouldn't be alarmed. But that's not representative of real life either. Neither predators nor victims of sexual crimes are exclusive to any group. We could talk about statistics but this is about perception of threat and fear. They're only very loosely tied to reality, especially when it comes to small samples like individual encounters with strangers.