Stating that the WTC was brought down by bombs is going too far (without hard evidence to the contrary, of course). Stating that the government let it happen is going too far (it's still invoking an active conspiracy based on no concrete details).
But stating that the military industrial complex benefited greatly from 9/11 is accurate. Stating that the motivation of Al-Qaeda was due to previous US Government meddling in the Middle East is accurate. That's mutual interdependence.
If the average person would have thought this way back in 2001, rather than the overwhelming groupthink of taking the attack personally, we might have avoided the government launching us into a 20 year domestically-destructive unwinnable war. But rather such thinking was dismissed as "conspiratorial" while the mass media blared out full on support for the wars. Remember Clear Channel's list of banned songs? That fucking "support the troops" dog whistle? To the extent that the political environment wasn't the result of a bona fide conspiracy, it's prudent to consider it an emergent one.
Democratic theory insists that by people talking to each other, sanity will eventually gain critical mass and win out. But this is hopeful thinking and not reality - it was basically impossible to debate this at the time. And while the democratic process eventually "worked" twenty years later, that's still twenty years of harm.
It's completely rational to mentally distance one's self from that harmful system, draw a boundary around it as an unfriendly system, and reason by yourself based on what ought to be. Of course you need to keep from being led into easy answers (eg the two bits I said were going too far above), that are non-actionable or worse, self-harmful. And unfortunately, that is also something masses of people seem unable to do.
So either way herds of people are seemingly always going to overshoot, and what really matters is whether a given conspiracy is productive or not. And ideally we'd all be less tied to monolithic results that create such remainders in the first place.