Rest assured,,, you did the right thing. Sometimes you have to "take one for the team", if you will. Well you took one for the team b/c now your herd will be better and stronger in the future. Alot of what we do during deer season effects the herd for many years to come. By shooting that deformed buck, you took out the chance that he would continue to breed does and thus having more and more deformed bucks. If you are truely a big buck hunter and you like the big racks.. then you did the right thing! My vote is YES, I would've done the same.
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!