I propose that we gather together historical facts and engage in 'friendly' (you don't have to be friendly but remember that ultimately this is a bit about shitting on awful awful people) debate to decide who was the worst President in the history of the United States of America.
Acting President doesn't count.
Fair. Biden has only been president for like 15 days, so he is now objectively the best one ever.
But Harrison didn't have the ability to drone strike people half the world away in a matter of hours. Biden's body count as president is probably way higher than Harrison could even hope to achieve in that time.