The "Teleology Lens" is only useful after the "Science Lens" has resolved that an agent capable of teleology is acting. Otherwise, it gives you an image that is not so much wrong as useless.
Suppose I leave a block of ice outside my house on a hot summer day, and I come back later and find nothing but a puddle of water. I can use science I can determine whether or not, given the temperature, the elapsed time, and the size of the ice block, the ice block would be expected to melt into a puddle of water.
If the answer is "no," then I can try the teleological lens: who stole my ice block, and why?
If the answer is "yes," then the teleological lens is useless. Note that the science lens has not proven that someone didn't come along and steal my ice and pour some water in its place to cover up the crime. What the science lens has proven is that such a hypothesis is unnecessary.
Now, "unnecessary" is one of those words whose meaning in scientific inquiry is a bit different from its everyday meaning. In the everyday meaning, eating the dish of ice cream I ate yesterday was unnecessary. But I did it anyhow. Unnecessary things happen all the time. So why should the ice-thief hypothesis being "unnecessary" make any difference in whether I should believe it or not? Why not "investigate" anyhow?
But the "unnecessary" in an unnecessary hypothesis has a stronger meaning. It really means that if the science lens cannot find a reason why the evidence requires an additional hypothesis to explain it, then nothing of value can be learned from considering such a hypothesis.
Suppose, for instance, that in actual fact, someone really did steal my block of ice, leaving absolutely no evidence except the absence of ice and the puddle of water. If due to being unwilling to entertain unnecessary hypotheses means that I never know about the ice thief, what do I lose thereby? Note that the ice thief has not done me any harm; the fact that the temperature was sufficient to melt the ice before I noticed it was missing means that I would have lost the ice in any event, even if the supposed ice thief had not stolen it.
If there were other evidence to make a thief hypothesis necessary -- such as the disappearance of an ice block too large to have melted by itself, a pattern of missing ice throughout the neighborhood, witnesses to masked men loading blocks of ice into the back of an unmarked van, a pair of ice tongs carelessly left behind at the scene -- then the situation would be quite different. Then the hypothesis of ice melting naturally would be no longer sufficient to account for the evidence. A thief hypothesis would no longer be unnecessary. And questions like "why is the ice thief doing this?" and "what if the ice thief strikes again?" would become at least worth considering, even if the evidence is not sufficient to fully answer them.
But to accept an unnecessary hypothesis is way more harmful to rational thinking than an unnecessary dish of ice cream is to one's waistline. It's like dividing by zero in math. It introduces a sort of unbounded variable into a scenario, from which wild fantasies can flow unchecked:
Holy crap, someone mopped up the puddle of water before I could collect samples that could have determined through trace-element analysis whether or not the water really came from my ice melting! Through my teleological lens, this looks highly suspicious! And why would an ice thief have bothered to steal the ice in the first place, let alone go to such great lengths to cover it up? It seems a lot of effort to go to for little reward. Unless my ice contained something of great value! There didn't seem to be anything in it. But suppose if it were full of flawless precious diamonds! Those wouldn't have been noticeable inside the ice, and that explains why it was stolen! It all fits! What, you don't find that plausible? Are you claiming that flawless diamonds aren't transparent? Or that it's not possible for diamonds to be frozen into ice? How can you be failing to see the big picture here, are you blind? I've been robbed of millions of dollars, and not only that I have a vital lead on the actions of a gigantic diamond smuggling operation. Such an operation would be capable of making huge amounts of money, and for what purpose? Perhaps to build particle beam devices to energize the upper atmosphere and bring about a new ice age! And yet, the police are telling me they won't even investigate! They cannot possibly be uninterested in what very well might be a multi-million dollar theft, a global diamond smuggling operation, and a plot to turn the world into a frozen wasteland! The only explanation is that they must be in on it too! Damn you, ice thieves! Damn you all to hell!!!!
And that is why the "Science Lens" is the one to use for 9/11, unless and until evidence requiring a teleological hypothesis is presented. Note that with regard to the plane crashes, such evidence (that there were hijackers, not just a series of coincidental accidents) does exist and a teleological hypothesis was accordingly created, investigated, and verified. Evidence that the collapses were inconsistent with the effects of the well-verified phenomena of structural damage and fire in the towers does not exist, so the hypothesis of the collapse being facilitated via planted explosives, accelerants, and/or thermal reagents is unnecessary.
An unnecessary hypothesis is by definition one for which there is no evidence requiring it.
If there are no facts for a hypothesis to explain, then nothing can be learned by investigating that hypothesis.
Respectfully,
Myriad