Not starting an argument, we all do what we think best.
In my case, the rust had already started a stress fracture, so cleaning up the rust didn't help.
My chain worked fine, until I stood up on the pedals and pushed down hard.
Just before the chain broke, my foot was standing on the pedal.
A moment later, that foot was planted on the ground while the bike and the rest of my body continued onward.
It was not a controlled landing.
I was in pain and at risk of never having children
Anyhow, that is my $.02 about why I hate rusty chains.