Personally I am very much against the hobby of hunting, I think it is more to do that I dont like guns. But that is only my personal like or dislike, I would not like to force my liking or disliking on anyone else.
Now talking about this post, I think it will not be fare with the poster if we simply say, "you have done a illegal thing by hunting an endangered animal". If I remember correctly I think the GB government does issue a special permit for hunting, and they charge a hefty amount for that (interestingly it is claimed that the earned money goes to safe these endangered animals). So if the poster has paid the license money to hunt a Ibex, I think legally there is nothing wrong in that.
I do not want to hurt anyone's feeling but just wanted to clarify things, and please do let me know if I have stated wrong information or not to update info.