Hosters rent hosts to tenants. Are landlords required to police the activities of their tenants and kick them out from a house? There should be no problem getting them to "let the police in" with an appropriate warrant but it is not up to the landlord to punish the tenant. That is a matter for the courts.
This privatisation of the justice system is to be shunned. If these people are criminals, it isn't fair to open up the hosting organisations to retaliation. That is why we have the "King's Peace." Vigilantism isn't something we encourage. No-one is in a clear and present danger, there is plenty time to take people to court. The content industries just don't want to spend the money and reap the bad publicity.
Humbug to them.
I find myself becoming more a freetard as time goes on. Not an infringer, but I'm simply not willing to pay for the rubbish the content industry churns out. I might watch it on telly when it comes out but I'm not going to the cinema or renting the DVD. I'd rather do without and play a game of monopoly with the kids.