If it’s literally true that anger is “necessary” for human survival then how do you explain people…

If it’s literally true that anger is “necessary” for human survival then how do you explain people who don’t exhibit anger and yet flourish — life seems to offer us many examples. I asked my daughter if she’d ever seen me get angry and she said only once. But I think I get on pretty well on life, indeed, much better than if I was prone to anger. So how …