Please Don't

Why do mom's suddenly acquire a language where every directive must include themselves even though it is clearly only intended for the child? I've noticed this phenomenon for a long while now and I vowed that I would not be a mom that it overtook. I'm a "say what you mean" kinda gal and I think it sounds silly to say "We don't smear peanut butter on our faces, please" or "We don't dip Sally Sue's hair in the paint." Of course we don't. I know I don't. Do you?
Sometimes the sentences make even less sense. "We don't try to grab Mommy's coffee cup while she's drinking." So... you're reminding yourself not to grab your own cup out of your hand? Weird. Or something like, " We don't get up from a nap before Mommy comes to get us, ok?" Now this is starting to sound like some sort of multiple personality problem.
Are these moms trying to remind themselves of forgotten etiquette while training their child? Are moms afraid that they will revert back to unacceptable behavior because of their 24/7 involvement with children? Do all moms, in fact, aquire a multiple personality because of the overwhelming suffering experienced in labor and birth? Of course, the answers to these ridiculous questions is "no." But, why do we all do it then? Why am I tempted to say to Eden "We don't pull Dolce's hair. We pet gently."? What force is at work in moms (and dads) to adopt this speech of inclusiveness? Are we afraid that a simple "Please don't do such-and-such" sounds too harsh?
Any thoughts?