Heck, not everyone is girding his or her loins for combat.
I went into MAs initially for self-defense, which speaks for itself. Very plain and basic pragmatism. But I just plain fell in love with the nuances of the process and training, and the challenge of seeing how far I can take it in a lifetime. What can you do with it as you age? Evidence is -- seeing all the aged people who have enormous power, even in their 80s or 90s -- that it's the stuff of a lifetime pursuit. Look what Ueshiba could do in his 80s. Besides, it's a lot of fun.