One problem with people backing into parking spaces is that cars usually have a bigger overhang in the rear than they do in the front. If the driver backs in until the rear tires bump into the curb, the car's rear will protrude far into the walkway behind it. That's one of the reasons why many motels have signs that say "Do not back in." There's also the issue of exhaust blowing right at people. Safety is another issue. When you park head-on, you are going with the flow of traffic. If you back in, you have to overshoot the parking space, then back in. Depending on the exact conditions, one method may or may not be safer than the other. In general, I don't have issues backing out of a parking space. I would think that in a location where backing into a place against traffic is possible, meaning little traffic to begin with, backing out should not be any more of an inconvenience.