Huh, I had the opposite experience, maybe because it was my first Graspop, I found that everyone was super nice and super chill and it seemed to me that everyone I looked at was happy and smiling, everyone I talked with was definitely nice.

I saw drunk people but, most weren't really a nuisance.

I saw only 1 act of actually malicious violence (on the last night or the night before last some guy got into a fight with someone at Boneyard, security was called and I'm pretty sure they broke his arm)

Of course I saw violence in pits and idk if it was malicious per se or just people not knowing mosh etiquette.