These are our own countrymen who are being betrayed by the scum in the other party. We are not invading some other nation, but are protecting our own citizens. Protect the honest, law-abiding portion of the city from these vermin and you’ll win the respect of most of them (you may even win their votes). Also indict the local politicians who’ve allowed this mess to happen...that’ll send a message.
People consent to the government they have and of they want change then they need to demand it. If we send troops to one city then how many other cities will need them next and where does it end? Do we evolve then into a totalitarian government under the auspices of we have to protect the citizens?
Be careful of the road you want to go down , there are consequences.