In a significant fraction of "malpractice cases" against the government, a suit is never filed. This applies for the military, the VA, the PHS, Indian health, etc.
First, the person who alleges injury must make an administrative claim against the government, then if the claim is rejected, they may file suit in federal district court. If it is a legitimate claim, then the government usually grants the claim and avoids trial. So technically, there was never any "malpractice suit." If the claim is rejected, it is less likely that the malpractice attorney will be willing to continue to trial. This is because the claim must be made in federal court, and plaintiff's generally hate federal court They would much prefer to spend their time on a potentially more lucrative state-court malpractice claim.
So if you actually do commit malpractice, it is likely to never result in an "official" malpractice suit. And because the case is defended by the US Justice Department in federal court, malpractice attorneys are generally less willing to take a 50/50 case on a contingency basis.