They don't get sad, they get extremely violent. Like, holy shit violent, especially when their social models are "Well, dad shanked mom's father and first husband to get her, seems like a successful strategy", which also drives social isolation as people go "Oh crap, there's a large group of young men over there, better kill them before they kill us. Also, we'll take their stuff while we're at it..."
Also, while remarkably peaceful compared to their neighbours, overall the People would still remark upon the low murder rates of Flint, MI.