How can "Obama and Clinton really believe that young people are all going to become extraordinarily altruistic just in time for Obamacare to be smoothly implemented"?

John Althouse Cohen is skeptical, in this Facebook post, linking to "Bill Clinton: Obamacare 'Only Works' If 'Young People Show Up' and Buy Insurance."

Clinton says (text and video at that second link):

"I think it’s important for you to tell the people why we’re doing all this outreach, because this only works, for example, if young people show up and even if they buy the cheapest plan, they claim their tax credit so it won’t cost them much — 100 bucks a month or so. We’ve got to have them in the pools, because otherwise these projected low costs cannot be held if older people with preexisting conditions are disproportionately represented in any given state. You’ve got to have everybody lined up..."

Now, I might suspect him of slyly undercutting Obama's grand plan. He's almost coming out and warning young people that the old are exploiting you, you should take alarm, and you can free yourself from this plot by saying no, I'm not jumping into that pool, I'm not lining up for my own destruction.

But Obama is sitting right there next to him. They're side-by-side in 2 big, upholstered Clinton Global Initiative armchairs. Obama restates Clinton's point:

"What happens is, if you don’t have pools that are a cross-section of society, then people who are already sick or more likely to get sick, they’ll all rush out and buy insurance. People who are healthy, they say, ‘You know what, I won’t bother.’ And you get what’s called adverse selection."

You can get snookered in a comfy chair.