While I agree with much of what you said, the simple truth is the same accident in a car produces much different consequences on a motorcycle. For that reason a motorcycle ride is simply an ineherently risky event, even with all prevention and riding focus being utilized.
Well of course, but so are the results of a plane crashing or a ski lift falling to the ground or divers being left in the open sea by their dive boat... thing is, you play the odds. And though none of those things are completely unpreventable, none are particularly likely. Same is true with being fatally rear ended on a bike, ESPECIALLY if you're diligent.
But what do I know, I've only been riding some 20 years and more than a couple hundred thousand miles.
I'm not saying couples with children are irresponsible for choosing to ride, but I would say those couple who decide not to have a perfectly justified reason for making that decision.
I find "perfectly justified" a patently ridiculous risk analysis, especially from a motorcyclist. Kinda like the time I was selling a Jeep with ski racks and the buyers didn't want them because "they would never do something reckless like that." But it takes all kinds I guess.
Don't get me wrong, to each his own, but I'm free to roll my eyes at the ultra conservatives no?