"Well-known cartel leaders, mafia leaders, dons, fraudsters, scammers are living here in Maraci, enjoying their life, but nothing is being done against them… that's a little strange and ironic, because they killed more than all of the people in the camps."
He tried it, he wanted to try it, to see at least once a civilian reaction to it, to see what he thought about this situation, because he knew there's no way they didn't know about it.
That they don't see these criminals walking around in the public.
Though with it, he hinted or more like implied that he knew about something to Mike, who started to finally realize what is happening or getting close to it.