system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Why is Central City so safe?

Metropolis is a hub for every alien attack on the planet. Gotham is the most crime-ridden city in America. By contrast, Central City has few superhuman attacks, and even those tend to involve few, if any, casualties. It's positively idyllic in comparison. Why doesn't Central City experience the kinds of crazy stuff the other major cities deal with?
gpt
A few reasons.

Firstly, the Flash has less of a hook, for lack of a better word. Superman is the biggest guy on earth and batman has his whole weird psychodrama bullshit. Wonder woman's a goddess and green lantern's a space cop. All draw in drama.

The flash less so. There's no equivalent for "take down a goddess" or "seize the green lantern"  or "rebuild krypton" or so forth- he's just a fast guy. The speed force isn't unique enough to him to justify going after the flash.

This leads to the second point- the flash is probably the nicest of the JLA. He's the friendliest. He's respectful to his foes. And what this means is he has few enemies. Sure Captain Cold and Mirror Master have to fight him because, well, they wanna do crimes and he doesn't want them to. But they're not enemies. The Top isn't  going to track down his family or anything. It's purely  professional.

He's not really done anything to piss anyone off enough to go to the effort of coming for him. The only people who really hate him are the reverse  flashes, and while they do crank up a death toll? Five guys. These days, basically just two guys. They're dangerous, but manageable.

Thirdly? The Central City mob.  Or, as they're usually known, the Rouges. They may look goofy, but they're powerful, clever and they're almost as  invested as the  Flash in keeping Central City safe. They're not like batman's rouges with their random violence or superman's rogues with their alien apathy. The Rogues are actual organised criminals, meaning they're invested in the city being functional, competition being nonexistent and there being no reason for the entire justice league to come calling. Start doing any gotham city shit and they'll shut you down fast.

Lastly? As a lot of who would wins will tell you, Flash is pretty damn good. He normally holds back but when he doesn't, he has perhaps the best power for directly protecting people. Fire a machine gun into a crowd and he can pull everyone to safety before the first bullet's left the barrel. It takes someone very powerful indeed to attack in a way he can't mitigate.

So there you go. Few people are willing to make a shot  at thee flash,  those who do are shut down by the Rogues, and those still going have the death toll reduced rapidly by the flash. Hence central city's saftey!