[aspasia]

And still, with all its faults, it is more efficient than any college teacher I’ve had. It’s a tool, and you have to learn to use it right. Can’t blame a hammer for hitting your thumb. Or for asking it to be more than a hammer. Or, like a car—you steer it.

[Antoninus]

Can’t blame a hammer for hitting your thumb.

Indeed. But you can blame the hammer when it's improperly balanced so that it hits your thumb even when you use it correctly.