Trump's running again because his first pass in office was wildly profitable, and he thinks he could get another shot at it. And that's just considering the stuff we know about (emoluments violations, government loans/grants to family members, "investments" from Saudis). Who knows what he got for access to those documents stored at Mar-a-Lago or things we don't know anything about.

Prosecutions*. And you say that as if their goal is to prevent Trump from becoming president again, instead of just... doing their job and prosecuting (alleged) criminals.