Exactly. This complaint cuts both ways. I often expressed a very similar sentiment but in defense of the "perpetrators". Remember all that kids who get expelled/prosecuted for playing around their school/university network and pissing off their lazy/clueless sysadmin? All that science stuff you could do then but you can't do now because terrorism (or because helicopter parenting)?
Where's the place for creative pranks? Practical jokes? In today's society, exploring, poking around, doing things for laugh seems... forbidden.
So wading in to someone else's construction and destroying it counts as "fun"? Kicking over someone else's sandcastle counts as "fun"? Kicking someone else's car to put a dent in the door is "fun"? Torching someone's house is "fun"?
Slippery slope, drawing the line, yadda yadda yadda, I'm interested to see what people think is "fun" and where they would draw the line. Given that it had no protection, how does destroying it gain or prove anything?
Finding weaknesses in a system that's intended to be secure is different, destroying something simply because you can is something I genuinely don't understand. No challenge, no victory, no benefit. I someone can help me understand the mindset of the griefers I'd be grateful.