You live with that play, IMO. I saw George get bashed on Twitter for saying basically the same thing, that he didn't allow him a good shot so you have to live with it. Some fans were going nuts because Lillard made it apparently they thought it was a good shot since he's gone like 5-5 from 30+ feet this playoff series. I don't care if he is 4-4 prior to that shot though, it's not a good look. He made it and that sucks for OKC but even if he missed it would have been OT so the pressure wasn't really on him that much.
He shot 39% from that range this year. I've seen hit that shot quite a bit. Westbrook shot 42% for all his shots.
BTW, here is an article with those stats. He took over 50 shots from that range.
http://www.espn.com/nba/story/_/id/26593473/nope-damian-lillard-series-winner-bad-shot