Microsoft has no obligation on protect its customers from themselves if they're dead set on shooting themselves in the foot.

Microsoft has no right to prevent its customers from having full access to the things they bought.

Must human arms be braced at birth so they can only point level, lest someone try to point any object at their own foot?

Yeah, but using your analogy, we do allow people to protect their communities from random strangers that want to disfigure other people’s arms.

In fact, I pay taxes to the police and they generally handle this sort of thing pretty well.