When I bought my cabin cruiser ( I no longer own it) I sat my wife (she also wanted the boat) down and had a conversation that went somethig like this...
ME: You do realise that this is the biggest waste of $$$ we have ever considered?
HER: Yes
ME:It is expensive to store, fule, use, repair, maintain, transport, and there are hundreds of things we could do with all that money we are going to blow every year???
HER: Yes
ME: We won't use it as often as you think, and as often as you want???
HER: Yes
ME: Well ok as long as you know and understand all those things and realise it's the most irresponsible we've done and your still good with that I say lets do it!!!
Just because you know something is stupid/foolish/irresponsible...doesn't preclude you from understanding that and doing it anyway...because YOU CAN and YOU WANT to...
Same thing goes with helmets...I've ridden in the past without one (used to do it regularly)
The day I wrecked I HAD to STOP at the NH/MA border to put mine on...had I not I wouldn't be here to bore you with my opinion...
I no longer ride without one...but that's not to say I won't wake up tommorro and "bet today is not my day to die" and blast down the road sans helmet...I KNOW the risk...but it should be MY choice...
(and I know if MA didn't tell me I had to I might not be here so they (helmet laws) "saved my life" but maybe If I hadn't had to take the time to pull over and dig out the bucket to put on and ride...I just might have beat that truck that dumped it's oil to the off ramp...and not wrecked at all!)