I think they do this to compensate for camber on the roads, so when you are ever so slightly steering right to counteract the camber, your steering wheel is facing directly straight ahead.
Ive had this be more noticeable after alignments before and returned to get it corrected.
They just need to adjust the tie rods accordingly to get the steering wheel perfectly straight. The link below will give you some basic info.
How to Center my Steering Wheel
You most certainly do not have to remove the steering wheel to adjust this - the steering wheel is installed in the correct position at the factory so that your indicators etc cancel when coming out of a corner, so if you mess with the steering wheel position on the steering shaft you will effect your indicator cancelling feature.
If Bridgestone aren't interested in straightening the steering wheel, then you might have to suck it up and take the car elsewhere for another alignment.
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