Besides the whole enslaving people thing for the most part everything the world government does is for the greater good.
They protect the true history because they know if it got out chaos will ensue and crime will rise
They try to keep the balance of powers to try to maintain at least some semblance of peace in the world
There's a reason why the revolutionary army isn't after the world government but the celestial dragons specifically.
Because the world government aren't inherently bad people they're just forced to act on the whims of bad people I.e the celestial dragons and Imu.
We saw that the gorosei at least some of them questioned Imu's use of the mother flame
Who only used it on a specific island because it was close
They're all just following orders and protecting the status quo
Just like kizaru said
He doesn't want to kill vegapunk but he's just a cog in the machine
Once the celestial dragons get ousted and imu gets pulled from his throne
They can use the system already set in place to create a fair and peaceful world
They protect the true history because they know if it got out chaos will ensue and crime will rise
They try to keep the balance of powers to try to maintain at least some semblance of peace in the world
There's a reason why the revolutionary army isn't after the world government but the celestial dragons specifically.
Because the world government aren't inherently bad people they're just forced to act on the whims of bad people I.e the celestial dragons and Imu.
We saw that the gorosei at least some of them questioned Imu's use of the mother flame
Who only used it on a specific island because it was close
They're all just following orders and protecting the status quo
Just like kizaru said
He doesn't want to kill vegapunk but he's just a cog in the machine
Once the celestial dragons get ousted and imu gets pulled from his throne
They can use the system already set in place to create a fair and peaceful world