that's definitely some gangster politics right there. the problem with gangster politics is you have to follow through, if you don't and try to fake it, you will be perceived as weak and no one will follow your rules.

getting the message out shouldn't be hard, it just takes some dystopian signs and PSAs in key areas. in one or two years, you can get the word out without actually having to shed any blood or pretend to shed any blood. there might be one or two who tried to call you out on a bluff in which case you absolutely do need to follow through. but so long as the migrant groups get the message with signs, patrols, and aggressive enforcement of the border, the bloodshed could be non-existent.