Actually, no, I really don't see "humanity" as "broken and bad." But that doesn't mean that everything is "just fine."
Your doctor analogy fails. I get regular checkups with the doctor, occasionally go in for something acute, but generally, just regular checkups. And not because I am "broken" but because I want to monitor my health.
Same with my cars. My cars go in for regular checkups. That doesn't mean they are broken. In fact, most of the time, they report is that they are, indeed, "just fine." In fact, at our last checkup, our 2017 CRV was assessed as "doing great."
I do not accept the assertion that humanity is "broken and bad"
Not everything for everyone is just fine, but that's a far cry from "broken and bad."