My usual answer when asked this question by someone who doesn't hunt is simply that hunting makes me happy. Some accept this answer while others seem offended that I should do something so selfish as to pursue my own happiness; to those folks I offer no apology. When questioned as to why it makes me happy, I offer the responses offered here (the joy of being out, the taste of wild game, being the most effective tool of wildlife management, the time spent with family and friends, etc...). Those answers are true but for some questioners those answers are insufficient. Beyond those answers, I can only say that hunting simply scratches some inner itch that I cannot explain and quite frankly, do not want explained.
Rbean (Mr Bean, I presume?
) posted a quote from Jeff Cooper that essentially becomes my final answer. I need to memorize that one.