I am in favor of lifetime appointments. However, the Court does need to police itself by establishing ethical rules. Chief Justice Roberts needs to establish ethical rules and conduct. It is pretty simple. This link below cites a list of recent ethical lapses from all Justices I think many of them are minor and inconsequential However, due to Justice Thomas's wife, there does appear to be more serious conflicts with him. It also calls out the need to have a code of conduct for SCOTUS.