As the main moderator here, I've been struggling with this.
On one hand, hunting is one of the main reasons people use slingshots. On the other hand, just going out and killing whatever you can hit is pretty morally shady.
If you're hunting for food or hunting pests, you're pretty much golden. We just don't want new users to go out with their brand new slingshots and say, severely but not mortally wound a squirrel- leaving it hiding somewhere in pain for hours until it dies. This is sad and happens a lot.
If you are game or even pest hunting, you need to be able to be accurate enough to be humane. Practice.
One more thing, be familiar with invasive species or pests in your area and know what species are protected. You do not want to be fined for killing a protected species but killing pests is usually pretty socially acceptable.
My first idea is to have a separate Slingshot Hunting subreddit, where users can gain tiered trophies showing they're responsible and practiced. I'm not sure though.
Thoughts?