In general kids are simply not hired and by the time they're an average age of 35 they've already demonstrated whether or not they're going to be the sort of folks who get convicted of felonies.
BTW, I would suggest that any professor at San Francisco State is probably a loser who will say anything for money. Wouldn't trust those guys to lead me across the street to get a beer .
Let’s analyze this logically.
Say we assume that the federal government does magically manage to hire only the perfectly competent sorts who don’t ever need to be fired.
Why wouldn’t business emulate that? I mean it’s not like a FOIA request wouldn’t make them have to spill the beans on the process.
If there was a consistent policy which weeded out incompetence, why would only the government use it? The suggestion that such a thing is likely is utterly preposterous on its face.
So either businesses want to hire incompetent people so they can later fire them (and waste money in the mean time on an unproductive worker) on a deliberate basis, or the government does hire incompetent people like everyone else does, and yet never fires them.
Given the existence of federal employment guidelines and how much of a bear it is to fire a government employee, I rather expect the latter to be the explanation. Logic would agree with my assumption.
As for your assertion that being 35 weeds out all the incompetent people, well then where do they all go? Is there a landfill somewhere filled to the brim with the remains of those incompetent people who are summarily disposed of before they reach this exceptional age of 35?