The guy was literally saving lives, rescuing people trapped in hot attics for days by floodwaters. More than 10,000 needed to be rescued, and it took days for the full force of military and volunteers to accomplish that, with some people dying during the wait. Your post is perhaps the most idiotic I have ever read here.
BTW, in case you missed it, the a-hole who is suing left his keys in the boat's ignition.
The Nola article has additional info: apparently he and two friends tried to call, text messaged, etc. to locate boats and owners to borrow them so they could get people out of water or from homes.
http://www.nola.com/news/t-p/frontpage/index.ssf?/base/news-6/1156572434292430.xml&coll=1&thispage=2