In Myanmar, as in most other cases, the government was an active belligerent; they wouldn't have been a check in any case. Genocides are usually conducted by groups that are already dominant in government, media, and society in general, so the kind of social institutions you point to are usually subverted before rallies (physical or virtual) directed imminently at violence occur.

So, it's quite unlikely that those institutions will check in-person rallies; more likely they will be organizing them and spreading their message.