I think he should have called Animal Control first to see if they would come relocate it. If they then refused for safety reasons or weren't available, I think shooting it is excuseable, although unfortunate.
The PA Fish and Boat Commission considers this a "nuisance" call, and wouldn't respond to it (due to lack of manpower).
http://www.timesleader.com/mld/timesleader/news/12092629.htm