I have yet to see a case of stronger ethical standards as outlined destroy any court
You missed to operative phrase "as it exists".
Graham knows that the current court is corrupt as fuck, and he's not wrong that tighter ethics rules will in fact destroy the court as it exists by removing the current openings for financial influence from the current judges. Conservatives know they're unpopular and any kind of ethics rules will hamper what they want to do (assuming they're actually enforced).