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The answer to this question can be found here:

One of the comments in the article links to another article on how to adjust your mirrors so that you dont have blind spots.

I hate the convex mirrors because I cant judge distances backing up in tight spaces.

It's probably because they distort the size/distance of objects, and drivers not accustomed to that might make an accident because of it.

Its the government. Making idiotic useless (or on a more moderate note: shortsighted) regulation is its purpose in life.