@Aichan
The public order is apparently held by a "vigilante corps", which to me sounds like volunteers. Rather, it's actually amazing that they can react this quickly considering the fact that they don't have an emergency hotline much less phones, nor do they come in automobiles. As a lord of the city, if you've got these kind of guys running around, you don't need to deploy your own men to keep order.
People wouldn't be running away from the city any time soon. It's probably the safest place they can be in - we could expect that the wilderness has monsters on top of your run-of-the-mill bandits and highwaymen.
@Belkin
Remember, the "villains" wanted to capture and/or bring them to their side. Now, the MC got some asspull powerup, and his friends were more powerful than they thought; I think villains want to see how far they could make the good guys more powerful. If I have to guess what their plan is going to be, it's probably a revolution (they need power), or to fight the demon king (it's been foreshadowed).