They do for kids whose parents are woefully inadequate. I've seen parents who'd send their kids to school in tattered clothes and without any food or lunch money. If people didn't step in - quietly - the kid would be in sad shape indeed.
Clothing and feeding a kid who is suffering through no fault of his own is not something you should be criticizing teachers for doing.
I'm really torn here. I grew up as one of those kids who rarely had lunch money, had awful clothes (to this day, I will NOT wear polyester anything) and no teachers bought me anything. If they had, it might have just given my parents more reasons to be irresponsible, ie. if the teachers will clothe and feed her, we can spend more on gambling. I started working at 13 (before some of the silly child labor laws got set in stone)and have been responsible for myself since. I am the only one of my family that turned out conservative Republican, so maybe the experiences don't prove anything....