I just saved one sim from Grim after she collapsed from freezing. She was on the street in front of my sim's house and my sim convinced her to group up. It would take too long to walk back to my sim...
Sadly I wasn't able to test more... But after the massacre and reading here for a while, I decided to delete some of my CC... After returning for short time in Game I didn't see that many Sims turn blue anymore. I will need to continue testing tonight and see if removing just CC has anything to with it. If it's some sort of CC that is causing these massacres I would be seriously surprised!