Your argument would carry more weight if other Presidents didn't all do the same. Trump's policies are better, both domestic and foreign.Other presidents have not done what Trump did with the documents. Obama was never in personal position of the documents that ended up in his presidential library and none of them were the kind of classified documents that Trump had at his club and subsequently lied about returning.
I agree there is ego at play with Trump (obv), but we know his lawyers made it very clear that he was putting himself at risk by not returning the documents. If his ego is such a destructive driving force that he is willing to risk felony convictions and jail time, is he really fit to hold the most powerful job in the world again?
I personally don't think Biden is running, but the southern border will sink any D.