Yes, there are some incredibly stupid 9/11 truthers.
It's something I've grappled with a lot here-- it's something that has frustrated me a lot because it is so distracting and gives 9/11 truth a bad name. For instance, shit like DEW or vicsims. The idea of these things isn't bad, but wholeheartedly buying either of these and then being fanatical about it as the answer is just so very wrong.
Now, obviously I promote some far out ideas here-- nukes and no planes, specifically. But my point has always been that I think these are the best explanations for what happened on 9/11, and I admit there is some chance I could be wrong.
It's not limited to 9/11 either-- you see it with Sandy Hook or the Boston Bombing, etc.
There's just a huge gullibility problem for many people-- once
they've accepted any conspiracy, they will accept anything that anyone
posts about it as fact, even if it contradicts something they've read or
seen before. And there are endless sites and Youtube videos spouting
some conspiracy "fact" without offering anything more than their
opinion, really. As long as you can sound authoritative, someone will
buy it, without any skepticism, it appears. Now granted, some people
are just dumb or easily misled or just have never been trained in
critical thinking. Sometimes, people are just busy and just go with it,
without taking the time to really deal with it. Sometimes things just
appeal too much to someone's biases.
But how to explain someone like Jim Fetzer or Judy Wood? They are supposed to be trained in science and critical thinking, and they can be so gullible. Wood is so off the rails she has to be either controlled completely, or mentally unbalanced. On the other hand, Fetzer is good on some issues like nukes and no planes, but shows amazing lack of critical thinking at other times. In some ways, he is worse than Wood, because is Wood is simply unreliable, whereas Fetzer is sort of reliable but than screws you over with some crap he just found.