Here are three true statements:
(1) Monopolies are generally illegal.
(2) Like baseball, patents make monopoly laws get a little funky.
(3) Courts really really really like to encourage settlements.
So, when two companies get together, and work out a settlement that makes a whole patent infringement lawsuit go away, and the only objection is that pesky Federal Trade Commission complaining that the settlement is anticompetitive, you can understand why a federal court could meditate on points (2) and (3) and dismiss that FTC complaint.
Yet, in FTC v. Actavis, the Supreme Court yesterday made it harder to settle some patent infringement suits, saying that sometimes a settlement of a lawsuit can be an antitrust problem.