Curious, how old are you and how long have you trained?
We learn MA because it is about personal growth and bettering ourselves. It can take many years, if not decades to come to this understanding.
Everything we do does not have to have a practical purpose. Why do so many adults participate in recreational sports? Or hobbies? It keeps our minds and our bodies busy, and we generally become better people for it.
Yes the world is dangerous, but its not as bad as you may think. Stay away from the bad parts of town, dont go to certain bars, watch whats going on around you, dont take stupid risks, and youll probably never need to use your MA. I myself havent hit anyone since fourth grade!
Iaido, jodo, kenjitsu and niten has taught me much about timing and distancing with an opponent. A great many of the techniques we learn, can be simply applied without a sword or a jo in our hands, its not difficult.
When I strike with my jo, or a broom stick, or a piece of 1x1 lumber laying around, I will break bones and cause you all sorts of nasty problems. Do not underestimate the archaic arts.