Ford pardoned Nixon, which led to the crimes/bribery/theft/fraud/lies/wars of the Reagan/Bush I administration. It also led to a common understanding that in America the big fish operate under different rules and are held to a different standard.
Reagan was let off the hook for Iran/Contra and Bush I pardoned everyone who otherwise might have testified against him. Then under Clinton they let bygones be bygones, bribery remain unpunished and stolen money stay stolen which led to the crimes of Bush II. (It also paved the way for Clinton’s impeachment because they knew the Dems would let them get away with anything and the public was ready for a story about people at the top not being let off the hook.)
If you don’t prosecute lawbreaking and hold accountable the lawbreakers, it will just happen over and over, worse each time. Throughout the Bush II administration the Dems refused to hold anyone accountable and look what’s happening today.