Justices knew what they were awarding and how it wiould be used. Oddly enough, Biden had it, too. He did zip with it.
"The Supreme Court gave Trump immunity. He’s using it as a blank check."
https://www.cnn.com/2025/02/19/politics/trump-supreme-court-immunity/index.html
Trump has expounded an extraordinary vision of his authority over the past month, relying on the Supreme Court’s decision last year granting him immunity from criminal prosecution as a blank check in his broader drive for power.