It can be hard to fire civilians - it takes a lot of dedication to doing the right thing - I managed to get rid of 2 that didn’t belong and the process on the easy one was over 6 months long....
I’ve seen one single case where the organization had hired a guy and they knew from the first two weeks...that he couldn’t make it (he was a GS-13).
They probably wasted at least six months discussing this and trying to find ways of doing extra paperwork, and finally the HR guy said why bother...the guy was on first-year probation and could be let go at any point. So a month later...they had everything lined up and told him he was finished. They escorted him around to wrap up out-processing and it worked exactly like it should.
When I was in DC, I knew of a case where the organization had a GS-14 who regularly insulted women and had a sip or two at lunch each day. He was two years away from the retirement point but some review by the insulted ladies came up. So, a decision was made not to fire him, but to find a one-man office just to push him in and let him sit out the two years. An absolute waste of manpower and pay. There’s probably forty-thousand such government employees out there like that guy. All sitting and waiting for a pension point. We’d better off to just separate gov’t pensions and force everyone into an IRA situation.