I think the greater factor is that these people realize that accepting the evidence and corresponding consequences that follow will ultimately result in them having to alter their cherished lifestyles in undesirable ways. By shouting down the messengers (scientists), they hope to stave off such changes.
It is, obviously, a losing battle. The longer they succeed in their childish game, the worse the outcome will be for them. “You can pay me now, or you can pay me later — with interest and penalties.” They keep choosing the penalties, hoping beyond reason that they will escape somehow at the last moment…
Cheers,
Bestia