>>507824965 (OP)The same reason why they mix with anybody else.
For example, you may have a beautiful blonde wife, but at the expense of risking your offsprings being born blonde and stupid. Also you'll have to endure a blonde wife for the rest of your life. If you're patient enough.
There is no perfect woman.
And that was jusr one example, there are bad things about everyone (redheads, blacks, jews, muslims, asian, mixed, etc.)
It's just nature.