1) While that is a legit concern, I don't see how it's a "privacy" violation. It's not you, so how is your privacy being affected? Also, you can remove auto-tags. Not to mention, accidental tags (or maliciously/jokingly incorrect tags) were possible years before, with or without auto-tagging.
Privacy may be incorrect but reputation certainly isn't given that potential employers are increasingly using the damned thing for evaluation purposes. And you can only remove the tags IF you have an account and are aware of the tag.
2) The issue of auto-tagging has literally nothing to do with using your photo for commercial purposes.
It has everything to do with commercial purposes. You are forgetting that FB is nothing more than a data warehouse that they use to aggregate then sell to advertisers. If tagging allows them to combine you with someone else that is valuable data whether you are on FB or not.
3) + 4): I don't see how these concerns are even about Facebook, let alone auto-tagging (to which they're not even tangentially related). Does it also upset you that people can publish your name or photos in a blog without your permission? I never opted in to Google but searching me by name turns up all sorts of things about me that I didn't explicitly approve. Why is this not an outrage?
It is an outrage and Google does provide a means of "removing" yourself from their searches unlike FB. Once you are tagged, bagged on FB there is no way to get unassociated from their data aggregation. Everything from your political views to favorite color is evaluated, cataloged and stored forever for later re-evaluation for its potential to make FB money. That, after all, is why they exist.