There is a plaque that hangs in a restaurant I frequent. It is a story about how God (or for atheists: genetics, or __insert your maker of choice here__) made families. One point the
story makes is this:
"He put diversity of opinions in our hearts not to drive us apart but to give us balance."
There's more to it than that, but that's the gist. Generally I think the thing that insures our survival is our diversity and differences. If we all thought and acted the same, drank from the same well, ate the exact same things, did the exact same things, lived the same lives, yeah, it might drive some of us less crazy, but it would be easier to do us harm and more harm would befall a greater number of us.
And life would be boring as all get out.
If it weren't for my wife, my daughters wouldn't be the brilliant, sensitive, academic achieving, scholarship-earning people they are. If it weren't for me they wouldn't be as hard-working, independent, self-taught, and one of them may not be one of the few women in the field of professional automotive restoration and mechanics, play the drums, be interested in shooting, and be stubborn.
Between that and the first line of my sig. I sleep a lot better.