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Seriously OP, did you NOT see the car behind you when you got into yours? I don't think it's physically possible to get into your vehicle at any angle without seeing it and the space surrounding it first.
Who doesn't look before they back up? Is the OP a woman?
or you can just move your eyes up about 12 inches and look in the rearview. putting a rearview camera won't help if people are already too lazy to look in the 3 mirrors they have.
I posted the back-up camera pic assuming his rearview mirror does not work.
Good thing a kid on a big wheel was not back there.