I think this is partially true. Additionally it isn't as 'cool' or whatever to destroy things when you get older. There isn't the desire to do stuff like that or be a part of something like that. Additionally the older you get the more you realize the consequences. People were being destructive because they thought they could get away with being destructive. (some will get away with it) And finally older people tend to weigh what they would lose more heavily than college age students.
The people that engage in these destructive activities, are people who think they won't get caught (or worth the risk of getting caught) and think others will be impressed or entertained by their actions. Their rationality is limited to the present. They do what they think will be the best or coolest thing for them right now. #YOLO
So, why this year? And why on a Tuesday? And why didn't we see cars tipped and poles knocked over last year? Does it mostly come down to nice weather during a late VEISHEA?