No, because it would be something else than critical thinking. It's like the scientific method, where you can't dismiss any possibility, unlikely as it be, but pursue the most likely explanations first.
Conspiracy theories bizarrely pursue the least likely explanation. Granted, this explanation might be real, but until new data arrives (Assange, Snowden, Manning, etc.) it can't outweigh the simpler ones.
I was able to find stats on violent crime by youth (mostly boys), and unlike self harm by girls, the rates of serious violent crime have been trending down for years.
https://www.statista.com/statistics/477466/number-of-serious...
In any case, there is a clear gendered difference in the average behavior of girls and boys.
There are lots of online cults though, not just on the chans. Tumblr is particularly bad. Lots of little Borg minds looking to assimilate young novelty.
Loads of teen boys are sucked into toxic online cults too including neo-Naziism, extreme misogyny, other kinds of toxic political radicalism, gaming addiction, self-help cults, etc.