Numerically, most change is bad.

And yet we make progress. It seems we've historically mostly been effective at hanging on to positive change, and discarding negative change

Yes, but that's an active process. You can't just be "pro change".

Occasionally, in high risk situations, "good change good, bad change bad" looks like "change bad" at a glance, because change will be bad by default without great effort invested in picking the good change.