That's how tyrants like to do it. ;O]
Censorship and control of the media is typically the first step. Sure it might 'solve' one set of problems, however once that's accomplished, then propaganda starts without any opposition because of said censorship and control of free speech unabated.
Remember the saying , "The road to Hell is paved with good intentions".
Besides, it's far better to have any hate and vitriol out in the open rather than having it going underground and allowing it to fester further in the dark where nobody knows what people are planning and thinking. Then people get strangely paranoid, seeing shadows in the walls, leading to doors getting kicked down and people slammed to the ground. See where that can lead to?