Why are baby teeth so sharp?!

I guess I've noticed before that, for example, puppy and kitten teeth seem significantly sharper than said animal's adult teeth and I suppose there's plenty of evolutionary reasons behind this.  But as Sam's two (that's right, count 'em TWO) toofers come in I'm questioning why human babies haven't evolved past the insanely sharp infant teeth! They are not, like wild animals, having to defend themselves from predators.  They are not hunting and gathering.  They are not gnawing on turkey legs.  They are (as they have been for a while now) eating milk/formula and smushed up "used-to-be-recognizable-as-actual-food" baby food.  They are essentially herbivores, so why do they not have herbivore teeth?!  Is it just to bite Mommy when she's not paying attention?  Is it to defend against Daddy sticking his fingers in there and getting all up in their business looking for more teeth?  Is it to bite other kids on in day care so Mommy has to go in and be scolded?  On second thought, that's probably the reason.  They've out smarted us and we're just to dumb to know it.  I get it now!