Napoleon famously said “ Give them a whiff of the grape (grape shot cannon ammo) and it DID get his opponent’s full attention.
Kent State did something similar.
The rioters like to toss fireworks at the cops.
If the cops response was “any fireworks tossed at us gets responded to with a flash-bang grenade into the middle of the crowd”, that would stop.
And any bullets coming from the crowd results in the crowd as a whole being fired upon.
Myanmar handled having a large number of Bangladeshi illegals by giving them a simple message: “leave or die”. Over 100k self reported back to Bangladesh.