Not for the justices, but for the institution of the Supreme Court. He files frivolous lawsuits and appeals designed to give his appointees the opportunity to legislate from the bench (e.g., "official acts"). He appoints blatantly partisan judges at all levels of the federal judiciary. And he sabotaged the FBI's inquiry into Kavanaugh's history, which is standard for any appointee at that level, by having any concerns be routed to the White House instead of handled by actual investigators. In short, he's demolished any pretense that the Court exists to enforce laws fairly, and has turned it into an unapologetic arm of the MAGA Republican party.

> if the norms mean giving all of our tax dollars to NATO for nothing in return

We do not give our tax dollars to NATO, at least not in any meaningful way. NATO's entire budget as an organization is about $4B/year, which includes valuable shared command/control systems. For the most part, we fund the American military, and we commit to using it in concert with our allies in certain scenarios.

In exchange, we get incredibly valuable hard and soft power. We get access to land in Europe to use as bases, which are staging areas for potential worldwide threats (e.g., an imperialist Russia). We get shared intelligence. We get goodwill with the rest of the West, so that they'll join our trade pacts. We get commitments of Polish tanks and British spies and French manpower if there ever to be a hot war, so that the US can focus on what it does best (air and naval superiority).

But also, you're the only one who brought up NATO. There are myriad unrelated norms that Trump broke the first time around, and will certainly break further this time, that make the institution of "the American government" less able to serve its purpose. Norms like, a president can't pardon himself. A president can't use his position to direct foreign powers to patronize his own businesses. A president can't summon a violent mob to Washington to overturn an election. A president can't conspire with state legislatures and militias to disregard the results of their states' elections. A non-sitting president can't steal classified documents, and can't have ongoing secret communications with a foreign power. A president keeps special counsel at arm's reach. A president shouldn't use tax policy to explicitly punish states that don't vote for him.