“Internet Service Providers have a pessimistic view of the future” ?!?

I read this article from Heise ( http://www.h-online.com/security/news/item/Internet-Service-Providers-have-a-pessimistic-view-of-the-future-917562.html) and I couldn’t stop asking myself : WHY ?!

I mean where is the problem in building a better protection from inside ?
Why Inside ?
Because most of the attacks come from inside their network or from the networks from their own partners.
So, guys, sit together to a beer or something and discuss how to act together against those bad guys.
And in the case that the attack comes from a network from another state which doesn’t obey to these rules, just filter them from your network.
This way they’ll learn that it is better to cooperate than to sit and do nothing.