Leave them be, It's their life. Anyways you seem to be acting like you know, ''everything''.
Yes we all should have knowledge, and experience. But in order to gain knowledge we must first: Try.
We shouldn't do spells for the sake of it, but we should be allowed to do spells.
It is advised to not do spells until you have, knowledge. It isn't needed, but many do follow it. You shouldn't do spells alot, but if your a newbie you soon realize..experience and nature are your only helpers.
You said yourself, your a newbie. Your valid words, not mine. So don't judge orhers, unless you want to be judged, and unless you'll judge yourself.
In order to gain knowledge, you need experience. In order for experience, you need to experiment. This could go on, and on. It's there life remember, so everyone needs to start somewhere. Good luck!