Because to confide a part of your soul to something that can think and move for itself is obviously a very risky business.
Enemies of the Heir, beware! You'll be next, Mudbloods!
Nasty temper he's got, that Sirius Black.
Being fed, and having a soft bed, and other people being in charge, seemed the most wonderful prospect in the world at that moment.
If you are writing children's books, you need to be a ruthless killer.
What's interesting about the wizarding world is when you take physical strength out of the equation, a woman can do magic just as powerfully as a man can do magic. A woman can fight just the same as a man.