To over-simplify, revolutions happen when young men get bored, gather into mobs to entertain themselves, and then somebody with a cause directs that mob into action.

The standard way to prevent revolutions is to channel the energy of young men into a productive job and a family.

But today, bored young men entertain themselves with video games etc rather than gathering in mobs to entertain themselves. We don't have large gatherings of aimless young men anymore.