Most likely you are accessing this website because you had some issue with the traffic coming from this IP. This router is part of the Tor Anonymity Network, which is dedicated to providing people with anonymity who need it most: average computer users. This router IP should be generating no other traffic, unless it has been compromised.
While Tor is not designed for malicious computer users, it is inevitable that some may use the network for malicious ends. In the mind of this operator, the social need for easily accessible censorship-resistant anonymous communication trumps the risk. Tor sees use by many important segments of the population, including whistle blowers, journalists, Chinese dissidents skirting the Great Firewall and oppressive censorship, abuse victims, stalker targets, the US military, and law enforcement, just to name a few.
In terms of applicable law, the best way to understand Tor is to consider it a network of routers operating as common carriers, much like the Internet backbone. However, unlike the Internet backbone routers, Tor routers explicitly do not contain identifiable routing information about the source of a packet.
As such, there is little the operator of this router can do to help you track the connection further. This router maintains no logs of any of the Tor traffic, so there is little that can be done to trace either legitimate or illegitimate traffic (or to filter one from the other). Attempts to seize this router will accomplish nothing.
For more information, please consult the following documentation:
That being said, if you still have a complaint about the router, you may email the maintainer. If complaints are related to a particular service that is being abused, I will consider removing that service from my exit policy, which would prevent my router from allowing that traffic to exit through it. I can only do this on an IP+destination port basis, however. Common P2P ports are already blocked.
You also have the option of blocking this IP address and others on the Tor network if you so desire. The Tor project provides a python script to extract all IP addresses of Tor exit nodes, and an official DNSRBL is also available to determine if a given IP address is actually a Tor exit server. Please be considerate when using these options. It would be unfortunate to deny all Tor users access to your site indefinitely simply because of a few bad apples.