Nobody should have to justify anything, and I don't understand this incessant need to try to justify or understand things that don't really matter. It should go like this... "do you enjoy it and does your enjoyment of it not harm other people?"
If the answer is yes, then that's it. People in general need to mind their own business more. Your body, your choice. "I enjoy it" is the only thing you need.
I love riding my motorcycle. It's inherently more dangerous than driving since there's no airbags, seatbelts, cage of metal over you, crumple zone, etc. Plus, motorcycles have less storage than cars. The only advantage over a car is better fuel economy. Several years back, I got hit by a van while riding (100% the other guy's fault, totally unavoidable, shot from behind another car in a median so it's not like I could even see him coming to avoid). I wound up with 6 rib fractures, bilateral pneumothorax (punctured lungs), fractured T12 vertebrae, fractured tibia (near the ankle), lacerated spleen, lacerated kidney, and several spinal process fractures. I was in a hospital bed for a month. I still ride.
People might wonder, "not only is it dangerous, but you were even severely injured doing it, why still do it?" Because I enjoy it, end of story. My body, my life, my choice. They don't need to understand it, and they need to piss off trying to convince me not to do it. Well, nobody's really tried to convince me personally to give up motorcycling, but I have seen other people try to convince others.
Don't try to justify anything, it'll fail every time. Everyone's goal is to proselytize you into their way of living. They can't just accept different people enjoy different things and just f**k off about it, which seems to have gotten worse over the years. Too concerned with what everyone else is doing in their own private lives for some stupid reason.