Notice the stark difference between Trump and Biden.

Biden already had the delegates and DNC was a formality to get nomination and go on to contest against Trump. BUT Biden realized that it's not good for the party and it's not good for the country, he realized he's not the best choice (& not in the best shape) and Dems cannot afford to lose to Trump. So he stepped aside.

Now look at Trump. Frankly speaking, he's an Armageddon candidate (like Greg Stillson), a disaster for America. Someone who exists purely for sadistic pleasure, retribution and feeding his malformed narcissistic self. His track record on Pandemic, insurrection, criminality, frauds, rapes and countless illegalities speak for itself. He should never be President. He should never even be a janitor in Parks department of local municipality. He's incompetent and completely unfit for any & all jobs. But Donald Trump craves for power. Like an addict who craves for his next dose when he's missed their last one.

Lesson - Do not ever give power to Donald Trump. He craves for it only so he can abuse it.