there is no such thing as a global internet police, though some institutions try to make themselves appear as such.
The problem is that every counrty is responsible for their own part of the internet, so to say. The US certainly wouldn't allow Russia to come to the US and impound US servers because they were infringing on Russian laws and in the same way Russia doesn't want the US confiscating Russian servers because they're breaking laws.
In addition the legislation for internet related topics differs from country to country and some countries have no legislation whatsoever relating to the internet. They have other priorities, like ending civil war or preventing starvation. So the concept of a world police, as such, is quite impossible for the time being.
In addition, I suspect many of these sites to be under observation from multiple law enforcement agencies, even if the site isn't in your jurisdiction, many of the people visiting may be and once you have collected enough data on them, they will press charges.
On a different note hacking isn't always bad. Many people learn about hacking not for illegal purposes, but because they want to be prepared and learn how to defend themselves. So called Penetration Testers, for example, are highly paid people that are hired by companies to hack them. These people will evaluate the company and create reports on the weakest links and how to better protect the company in the future.Personally I am interested in learning how to hack, not to break into other people's website but to better understand how the victims were owned.