True the odds of dying are higher on the Seward Highway, but the children are basically sitting ducks for the environment.  It's stupid to risk your kids over such an ego boost.
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It's not about "knowing" what they are about, it's about what the action plan is if a rogue wave or other ocean travel problems arises.  The toddler is dead meat for certain, and probably many of the younger ones as well.
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It's just plain stupid to take kids that young into a wilderness setting.  They are not self sufficient in an emergency situation.  What they are doing is basically sacrificing their kids at the first emergency that occurs.  STUPID.