I just want to know why conspiracy theorists do what they do without ever lifting a finger against the 'enemies' they're supposedly fighting against.
It's just how they are. There's no logic with those types.
To be fair, it's there in the definition: they are conspiracy
theorists, not activists. If they ever get the strength of having been in the right, it'll have been precisely because they were looking from the outside.
Plus... You can and are permitted to have a strong opinion on something, mouth it off to whoever is willing (or not) to listen to you, and make both founded calls and judgment calls based on what you know about the subject and that the subject "appears to be" when looked from the outside. I mean, for a conceptual base let's look at any sports fan. The most common complaint you'll ever get from them is "the coach is doing X wrong!" (in particular if X is a thing that is
obviously being done wrong, eg.: the team is losing), and they can think they would toooootally do it better. But neither we
nor them are going to seat them on the bench to do that work. It's not convenient for
anyone.
Extrapolate that behaviour to an issue that has an even stronger feedback effect on public opinion, give that person more spare time to dedicate on the subject... bam. Instant conspiracy theorist.
Fun thing is, from a public safety perspective, we
want those people to be mouthing off more or less randomly. We as a society get the benefit of some eyes being kept on issues of severity, or issues that should not be forgotten, but without the harm that could be derived from direct involvement if those people were actually activists. The instant you
stop hearing that background noise of "but 9/11!!!!one", you know something has gone wrong and have to start to worry.