I'm not sure young kids expecting to be given what they want when they ask nicely qualifies as SS; in a lot of cases, it simply means they haven't learned the other half of the lesson, yet. Now, if it's being used by someone past the age of 7 or so with the same expectation, that's a different story.
I've told this story before. I was up on stage at the church we used to go to, and found someone going through the bag of drum sticks that belonged to Mr. Sirius' band's drummer. This gentleman has played drums since he was 10 (he told me) and he's now 65+ and has quite a collection of specialty drum sticks that he carries around in a leather bag. I asked, "May I help you?" The person going through the bag was a young man of 25 or so, and there was a little boy with him.
YM: My little boy wants a set of drum sticks, so I thought I'd take one of these.
Me: All these drum sticks are the personal property of the drummer.
YM: Oh, we thought they belonged to the church.
He took his son's hand and they scurried away. My jaw was down around my knees. So if the drum sticks belonged to the church it was okay for them to take them without permission/steal the drum sticks? I sought Mr. Drummer out and warned him that someone was looking to walk off with a set of his drum sticks, so he secured them. Had they asked him (I pointed him out to them) he probably would have passed along an old set since I'm sure he has thousands of sets of old drum sticks that he can no longer use.
When I was a child, if I'd asked to be given something that clearly belonged to someone else, I'd have been in big trouble. It's like the little girl who was playing on my front porch: I told her she wasn't allowed to play there. "But my mom said it was okay!" I explained that it was my property, not her mother's, and I didn't want her playing on my porch. This little girl actually got the message, and it never happened again.