"This has worked very well due to our personal involvement with a lot of said organizations. If we find an abuser on IRC, we try to not only ban him or her, but also to contact the provider so that the problem is handled at the right end, often with the involvement of law enforcement, as was the case with Kevin Mitnick, t0rn and a lot of other well publicized hackers/crackers."
Of course it is. If someone cost you time and money and severely harassed users of a service you're offering by illegally attacking your servers, then I bet you'd be all for reporting them as well.
The problem with script kiddies is that they're too lazy to create anything of their own and thus cannot emphasis with how hard it is to set up and maintain a free public service. So they don't have any second thought about destroying other peoples hard work. Plus the pseudo-anonymity of being online and the ability to not look your victims in the eye make such crimes easy for even some of the more ethical kids to shrug off.
The only way to have an open internet where everyone is free to create and contribute is to rat out those who seek to destroy it. People like the aforementioned might enjoy all the perks of an open internet, but their actions have the opposite effect.
So I'm not only in favour of reporting abusers, but have actually reported attacks on my own servers to their respective ISPs.
I'm not sure that is something to be proud of.