I think you're arguing against a straw man here. Who is arguing that all salaries should be cut in an overly broad way?
Well, you were, for one...
This is an ongoing problem with public sector employees. When you consider the legal protections they have in their jobs, the benefits and the stability they are simply being overcompensated compared to the private sector. It has to come back down towards normal. Their actual salary should be lower than the private sector considering all the perks they have.
Maybe you really meant on average their salaries should go down, while maybe even raising them for the higher skilled folks, but that's not how I read it.
And our elected officials are ACTUALLY doing what I'm talking about. Across the board salary freezes, cost of living freezes, dramatically limiting money for performance based promotions...all of those apply to basically every single federal employee.
Anyway, a lot of people with higher degrees are probably happy to work for less pay in the federal government for quality of life reasons.
Sure, you have to look at the whole package when it comes to ANY job...salary, benefits, quality of life, etc. The problem is that the federal government can basically only offer one package in terms of the tradeoffs.
SOME people may be happy with the quality of life in exchange for a lower salary, but that might not work to attract the best people for all parts of the government and for all types of people. Do you want to pay a CIA officer more because he has a high stress job where people could die if they screw up (quality of life fail

)? Sorry, nope...he's lumped in with the mailroom guy at the IRS in the overcompensated government employee pile.