And that designed failed spectacularly from the beginning. As the post you're replying to points out, slavery is essentially the majority deciding that a minority and their descendants have no rights whatsoever. This state of affairs lasted until the 1860s and even then those rights for the minority were severely curtailed until at least the 1960s.

I wouldn't say it failed spectacularly. The trade-off was well known amongst many even at the founding of america. There would simply be no America if slavery was disallowed from the beginning.

A hospital could still be a net positive for society, even if sometimes people go there and die who otherwise would have lived if they did not go to the hospital.

Was there a majority that was pro-slavery? My understanding was the agreement was that it was a minority that wanted slavery, and that slavery would be kept to that minorities states?

The Puritans were a minority group among the original settlers to the US, among the Dutch, French, Spanish, other British settlers and others. The founders and architects of the Constitution and US government were not Puritans.