Thought of another reason!.. Say the elephant riding is not really that dangerous, so you would be advantaged to give the impression it is more heroic by wearing the protective gear. A bluff.. I'll call it the Evil PsuedoKenevial factor..
"I'm doing this extraordinary feat, it may not look dangerous, but it is!, its so dangerous I need all this extra armour"
Perhaps this is really why Kato wears the black sphere of mystery, to make sailing down the little kiddie pool look a little more impressive.. Or, another hypothesis why Kato wears the visored dome is he thinks he is the long lost Power Ranger..
Kato Ranger fits right in!
....
I would like to point out the obvious in my previous post, which is we do not, not wear helmets so we can pass on our genes, its just the only genes left in the gene pool are for the risk takers.
And yes I understand the extent of risk takers in a population varies, if we could measure windsurfers opinion on personal safety we would get a nice normal distribution.
Lamarckism would see people who sustain multiple head traumas produce kids with thick skulls..
Protective gear mandatory? all those upturned fins should be mandatorily in the sand, for beach safety!.. Also are the Santa hats mandatory? I've never seen that Old Fart with the grey DK harness celebrate Christmas..