Because they're better informed than the True Believers need them to be, as the lamentations of this particular True Believer show.
From the Weekly Standard: The More You Know, The Less You Care.
But, as Professor Sowell tells us (hat tip: Wendell Sawyer):
" The bigger problem is that this has long since become a crusade rather than an exercise in evidence or logic. Too many people are too committed to risk it all on a roll of the dice, which is what turning to empirical evidence is."
Perhaps the conference he discusses will get enough attention in the media to cause some attention being paid to the realities of "Global Warming".
And the Easter Bunny's on his way, too.........