Do you judge kids at a music festival?

[MonstranceClock]

Next year my daughter will be old enough to come with me to a festival that she wants to go to. I went myself this year and saw lots of kids her age, all having a blast. However, a few of the parents had issues with people coming up to them and telling them that children didnt belong there and they should be ashamed.
I personally don't see the issue, it's basically just a huge fair ground with live music.
If you do judge, aibu to ask why?

I’ve been to Leeds/reading festival, download, belsonic, Glastonbury and Slane. I personally would not take a child under 13/14 to any of these. There’s not much to do for them really, they would be tired from standing and walking most of the day. Also some of them have age restrictions though not sure of what ones and what the restrictions are. also there’s so many drunk people at them, and although you might not hear of it there’s always drugs at all of the festival.

I perform at festivals. It's wonderful to see people of all ages joining in.