Laughter is an asymmetric weapon.
An authentic laugh communicates to everyone in earshot: "I don't think this is serious."
The question is: when someone laughs, will the crowd join in or will they punish them?
The answer comes down to: does the crowd want the thing in front of them to be serious, or do they not?
If you laugh in a church, you'll get shushed so hard you might get whiplash.
If you laugh at an authoritarian, where everyone is fearful of how serious the authoritarian is but doesn't want it to be serious, others might join in.
The authoritarian is intrinsically fearful of laughter.