I understand that. But we don't give them a list of inappropriate words to click on. You have to think from a parent's perspective too...when they say, "well you let that icon just be there..." Five, six, and seven year olds don't make a habit of using inappropriate language. In schools you have to reduce adding "fuel to the fire."
You can stop them from downloading certain things with device management. Which is why it would make more sense to offer the emoji keyboard additions as downloads to install instead of just dumping them on with an iOS update. The kids need the update to get rid of some of the bugs, etc... While we have deployment software, not every package can do everything as Apple doesn't allow them to....for instance, you can't get rid of/or hide iTunes....This falls in the same category right now.