Since you seem to be logging edit history internally, how about making that visible to users? There would be a lot less confusion and paranoia around if it were obvious when an edit was made and by whom.
Alas, I think the odds are that there would be more, not less. Certainly there would be a lot more fodder for it. These things don't explain themselves, after all; we still have to do that, and it's a ton of work. It's also stressful—it's all public, and if you screw up in any way, you can easily generate more hostility and more work for yourself.
I think the current approach, in which we don't publish everything we do but are happy to answer specific questions when people ask them, is the right balance.