Start here ^: You said you replaced your tires, but you didn't say what, if anything, you noticed about the tires taken off.
All good questions. I doubt the unibody (sometimes mistakenly called the "frame") is bent -- the misalignment is not that extreme -- but, more important, if this is related to the accident you had, it should have been included in the repair work and (perhaps) covered by insurance.
I agree. And, let me add, two degrees of negative camber, while not extreme, is still an "other than normal" number for normal driving. (Negative camber means the tire is tipped in at the top, out at the bottom.) If it were on the left front rather than the left rear, it would be fine for autocrossing, but two degrees of negative camber is not something you want on the left rear or for commuting. If accurate, it needs to be corrected or, as you were told, it will result in noticeable, pre-mature tire wear. How much and how quickly is tough to call from here.
