Odd that,the use of the word forced. If they had any new evidence or proof you would think that they would be shouting it from the rooftops. The thought processes of truthers are a dark mystery.
"Forced" is the right word, though, strange as it seems. For some, in their minds, R.Mackey's test is just a ploy to ruin it all for them. A mistake they'd never make if not forced to.
I think some of them just like to keep their alternative narratives of 9/11 secret, to preserve the freshness.
So that one day, when everyone suddenly realizes "hey wait a minute, small oxygen starved jet fuel fires can't melt steel into its own footprint at freefall speed!" and then we're all "oh noes, all our journalists and scientists and engineers and judges and prosecutors and historians have failed us, we're confused and lost" and pretty soon all of society is paralyzed and despondent and everyone starts pleading, "please, someone tell us what really happened on 9/11, it doesn't need to make logical sense or have any evidence, it just needs to be a story we haven't heard before so we can believe you and follow you and elect you our new chancellor for life," and won't they be in the catbird seat then! -- because they were patient and didn't reveal their goods too soon.
There is a measure of dark mystery involved; since I can't read minds I can only hypothesize the least implausible thought processes that would be consistent with the observed behavior. I could be wrong, but if it's not that one, it's something stupider.
Respectfully,
Myriad