system
Given the following post, respond as if you're commenting on Reddit:
human
[One Punch Man] is the hero association the only form of public protection? Where's the police? How's the government like? Are all the lettered cities the only cities in existence? Also how was the opm universe like before the Hero Association? Monsters running everywhere killing dozens of people?
gpt
> is the hero association the only form of public protection?

No, there's the police, military, and incredibly skilled good Samaritans.

>  Where's the police? 

They're around. 

> How's the government like? 

We don't really know, but the wealthy control everything and pay for their safety and it appears the hero association acts as a pseudo arm of the government.

> Are all the lettered cities the only cities in existence? 

We're not entirely sure, but the general consensus seems to be that each City is about the size of a country. It might be that the OPM world is small or they're traveling quite fast too get from City to City and have as few heroes as they do. It could also be that there are several countries and we're just looking at one.

> Also how was the opm universe like before the Hero Association? Monsters running everywhere killing dozens of people?

Monsters were, and for a large majority still are, wolf/tiger level threats at their highest. You maybe had 5 dragon level threats max that were dealt with by Blast. The police are able to handle wolf/low tiger and the military can handle high tiger/ low demon. With the introduction of heroes, they were needed less and could focus their efforts in other places.

Of course this is mostly speculation as there's a lot about the world we don't know.