Right, because we cannot hold people accountable. I'm pretty sure that if it's the President, that's not allowed, and the Constitution says so. You can look it up.
FWIW, impeachment during the first term to prevent that person from running again has been a viable option since the founding. What is at issue here is if the President engaged in an impeachable act at the end of his term, and after he lost, whether or not impeachment can be pursued, even if he's out of office when the verdict is handed down. The theory the MAGA contingent are advancing is impeachment can ONLY be used against a sitting President. So if he resigns the day before a Senate conviction vote that he knows he'll lose, the Senate cannot have a vote, because he's out of office at that point.
So it removes disqualification from the list of remedies, because, the argument goes, if you cannot remove him you cannot then get to the 'and' part which is disqualification. Seems...unlikely that was what the founders intended, that they wrote into the remedies disqualification but in a way that allowed all but the biggest morons to avoid it, by resigning before a verdict, or doing the bad acts at the very end of a term.
And it's notable that we also grant former Presidents likely $10s of millions in benefits - an office, lifetime SS protection, pension. Impeachment removes those as well.