Tracing down something to an IP address can be a solid pointer for a courtroom - remember, if it's a jury trial, and it goes that far, you have to convince the jury, not the judge - this means a good lawyer and no smoking guns will get you off. If a common person has an IP that leads law enforcement to their doorstep, then that person is screwed. A good lawyer can make all the difference, but having a fairly diverse network with potential vulnerabilities could go a long way.
I've seen worse things - PenTeleData (ptd.net) puts their subscriber information into their reverse DNS. I'm just glad I don't use them. Does their doing this constitute a breech of their promise to not provide customer identifying information? I think yes, regardless of how you defend against being tagged with your IP, it can still give out a lot more than you'd want to share.
This block, 220.127.116.11/24 is owned by ptd.net – and this ISP, located in Eastern PA, puts their customers names in the reverse lookup of their IP address. Tell me that these folks don't get more than their fair share of P2P lawsuits and targeted advertising.
18.104.22.168 : cpe-static-jpjayassoc-rtr.cmts.all.ptd.net
22.214.171.124 : cpe-wifi-subwaytilghman-145.2.1-ap.cmts.all.ptd.net
126.96.36.199 : cpe-static-aestheticsurgery-rtr.cmts.all.ptd.net
188.8.131.52 : cpe-static-thecontigrpmdm2-rtr-cmts.all.ptd.net
184.108.40.206 : cpe-static-apa612wlindenst-rtr.cmts.all2.ptd.net
220.127.116.11 : cpe-static-ramadainnkiosk-rtr.cmts.all.ptd.net
18.104.22.168 : cpe-static-cntyoflehighgovtcntr-rtr.cmts.all.ptd.net
22.214.171.124 : cpe-static-westendpharmacy-rtr.cmts.all2.ptd.net
126.96.36.199 : cpe-static-bnaibrithapartments-rtr.cmts.all2.ptd.net
188.8.131.52 : cpe-static-adultmedgeriatics-rtr.cmts.all2.ptd.net
184.108.40.206 : cpe-static-cysticfibrosis-rtr.cmts.tv2.ptd.net
220.127.116.11 : cpe-static-stanleywest-rtr.cmts.all2.ptd.net
18.104.22.168 : cpe-static-panylentzengineering-rtr.cmts.all2.ptd.net
22.214.171.124 : cpe-static-drhabig-rtr.cmts.all2.ptd.net