he said "former president" and you are saying "president". not the same thing. the important difference is that the president has a lot of power while in offic

he said "former president" and you are saying "president". not the same thing. the important difference is that the president has a lot of power while in office, pardon power, and many immunities. If a president is "corrupt", their power is great, their prosecution will be very difficult, but there is a reason to want to stop them. A former president has lost those powers and immunities, and in the same sense is also "no longer a threat", so in most cases it's not "necessary" to take legal steps to stop them from further crimes or transgressions. And in both cases, the due to the nature of politics, there is a desire to avoid feeding the political hunger for revenge thru malicious prosecution. Both sides have found it in their interest to let the wounded political warriors retire from the field, and focus the fight to those remaining.