Backing into parking spaces

I back in to parking spaces because

 1) the rear bumper is higher and not as likely to get damaged by a high curb than the front spoiler. 

2) you have much better situational awareness of other traffic as you enter, when you're in traffic instead of entering traffic, and so better able to avoid an accident

3) as you leave, you have a much wider field of view when entering a parking spot than when you're leaving, and since you're often more tired when you're leaving, or often there's condensation or frost on the window, you have a much better chance of seeing approaching cars if you're facing the road and driving forwards when leaving.