Dangerous how?
I think the “dangerous” part is that some might take Q conspiracies as real and act on them in real life, hurt themselves or someone else etc. Like the guy who shot up that pizza place or the woman who threatened to kill her kids to save them if Biden is elected. Or attack politicians/celebrities who are supposedly in on it that sort of thing
I mean some of the people who read into this stuff aren’t exactly all there in the first place, but I guess that can happen with anything