"Denialism also refers to a set of rhetorical strategies used to create the impression of uncertainty where none exists. Unsurprisingly perhaps, these bear a strong resemblance across the various species of denialism."
Ah, I see. "Denialism" is what zealots used to call "heresy":
"...but as for the others, since, in our judgment they are foolish madmen, we decree that they shall be branded with the ignominious name of heretics, and shall not presume to give to their conventicles the name of churches. They will suffer in the first place the chastisement of the divine condemnation and in the second the punishment of our authority which in accordance with the will of Heaven we shall decide to inflict." (http://en.wikipedia.org/wiki/Edict_of_Thessalonica)
Since we're making up words, I suggest "scientism". That's the religious system practiced by people who pretend (even to themselves) they're practicing science, but who actually have no confidence in the scientific process, or the ability of others to make rational decisions based on the findings of that process.
Instead, they chatter about the need to enforce orthodoxy and limit public discussion of controversy, lest those who lack enlightenment become confused and lead others away from the true path.
There's no time to waste: Some may already be lost, actively in league with the evil which seeks to damn us all to eternal suffering. Left unchecked, that could require the defenders of the faith to resort to more drastic means of purging the seeds of doubt, beyond even excommunication and shunning. An unfortunate necessity, but this is Science we're defending, not some fanciful, power-hungry, and corrupt old belief system.
And when the world's salvation is at stake, is anything too extreme?