The problem is that if you have a problem and want to solve that problem, the first thing you do is talking with the person.
Instead of trying to fix this like normal persons, you want others to work for you by free.
Who gives you the role of a judge in this case, to even consider that the actions from that ip where illegal.
If they were illegal why don't sue? If you ask a lawer the first thing he will tell you will be to talk with the other parties before starting legal actions.
I really hate to use this analogy, but consider abuse desks the police of the Internet for a second.
Your local ops team notices a lot of SSH break-in attempts coming from Sprint's network (for example). They forward the logs on to the abuse team, who reach out to the abuse team at Sprint. In the same way that a cross jurisdiction investigation would be handled by two police departments working together, the two abuse teams will work together to investigate and remediate the problem.
Now imagine if the Seattle Police Department contacted the Chicago PD about an ongoing investigation of a jewelry heist, and the Chicago PD says "we are too busy to deal with this" and forwarded it on to the thieves so they could respond directly and help the Seattle PD with their investigation... Now the investigating officer is compromised and at risk. Sure, he was a known as a cop to the bad guys before, but now his enforcement actions have made him a direct target.
This is a system that has worked for 20+ years. We have our own mailing lists, meetings and conferences, heck even a private direct dial phone system.
Except that the communication between police departments is clearly marked or known (because of various regulations/laws) to be confidential. Here it's not clear (as I've also mentioned in a previous comment [1]).
Instead of trying to fix this like normal persons, you want others to work for you by free.
Who gives you the role of a judge in this case, to even consider that the actions from that ip where illegal.
If they were illegal why don't sue? If you ask a lawer the first thing he will tell you will be to talk with the other parties before starting legal actions.