More commonly, these are simply different matters, and the different parts of Government that handle them don't care. Even more generally, governments ruled by

More commonly, these are simply different matters, and the different parts of Government that handle them don't care. Even more generally, governments ruled by laws do not care in the sense that they do not, as a system, carry grudges and the like. A government contract is awarded by tender, for which there are rules. And unless you have exactly the same people handling two issues, there's just no mechanism for any interest to bend the rules to be transmitted from one group of people to the other. There are sometimes cracks in this system, but even those are somewhat formalized: "buy American" rules, for example. There are also rules that apply to government contractors but not businesses operating in the private sector exclusively, such as higher minimum wages, enhanced environmental protection, or union requirements. The reason here is that these can be instituted by the executive alone, without the legislative. But punishing a single company just because they're taking an issue to court? That'd be consider rather corrupt. It's also silly: there are thousands of lawsuits between governments and private businesses every year. Every single Fortune 500 is probably involved in a few dozens at any given time.