I strongly disagree. They shouldn't have monopolies on violence. Violence should be distributed freely but regulated and organized. Police or security companies should be hired as backup, but with no more rights than anyone else. (qualified immunity is huge problem) What you're seeing in Brazil is a chaotic transition state between one system to another, because the country had been overrun with criminals who expected no resistance. It gets worse before it gets better, but getting better doesn't necessarily mean control back in the hands of police departments.