That's not common knowledge to me, especially since I don't live in California. You have asserted certain claims and offer no evidence. "Common knowledge" isn't evidence.
> The data for public salaries generally has very good availability in the Information age.
The salaries don't seem particularly high, and in some cases (construction workers and bus drivers, top quarter) seem particularly low. Of course a lot more goes into job satisfaction than Salary but I agree, this is not common knowledge.
The point that BUS DRIVERS working for GOVERNMENT make better wages than BUS DRIVER working for PRIVATE sector. Not that bus drivers in general are rich people.
Ah. I think you've misread the comment in that case. The argument wasn't that the same job was typically better in private than government sector. It was that the types of jobs typically available in government (like the ones you mentioned) are viewed as less desirable in general, despite having good benefits, shorter hours, etc.
I do not know how to even reply to that. Bus drivers, post delivery people, municipal construction workers etc. - all have better salaries and benefits than similar private workers. I am not sure how any adult living anywhere in US could manage to not know that.