Because everything done by a government should be for the public interest, even if one person or a small group is directly benefited. I'm not a US Constitution

Because everything done by a government should be for the public interest, even if one person or a small group is directly benefited. I'm not a US Constitution specialist, heck, I am from Brazil. But that's usually how things are: You don't exactly need to keep saying "_this_ is for the public interest", because _everything_ should be.