Adam Serwer on the immunity argument:
Trump’s legal argument is a path to dictatorship. That is not an exaggeration: His legal theory is that presidents are entitled to absolute immunity for official acts. Under this theory, a sitting president could violate the law with impunity, whether that is serving unlimited terms or assassinating any potential political opponents, unless the Senate impeaches and convicts the president. Yet a legislature would be strongly disinclined to impeach, much less convict, a president who could murder all of them with total immunity because he did so as an official act. The same scenario applies to the Supreme Court, which would probably not rule against a chief executive who could assassinate them and get away with it.
The conservative justices have, over the years, seen harbingers of tyranny in union organizing, environmental regulations, civil-rights laws, and universal-health-care plans. When confronted with a legal theory that establishes actual tyranny, they were simply intrigued. As long as Donald Trump is the standard-bearer for the Republicans, every institution they control will contort itself in his image in an effort to protect him. […]
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No previous president has sought to overthrow the Constitution by staying in power after losing an election. Trump is the only one, which is why these questions are being raised now. Pretending that these matters concern the powers of the presidency more broadly is merely the path the justices sympathetic to Trump have chosen to take in order to rationalize protecting the man they would prefer to be the next president. What the justices—and other Republican loyalists—are loath to acknowledge is that Trump is not being uniquely persecuted; he is uniquely criminal.
This case—even more than the Colorado ballot-eligibility case—unites the right-wing justices’ political and ideological interests with Trump’s own. One way or another, they will have to choose between Trumpism and democracy. They’ve given the public little reason to believe that they will choose any differently than the majority of their colleagues in the Republican Party.
They are partisan above all else. There’s no other way to interpret their actions. They also have immunity from any accountability since we now know that the impeachment clause is completely impotent and they have lifetime terms. They don’t care.