Often for unloading. Say at the community center, back into a spot that goes to a sidewalk, then unload from the tailgate there instead of standing in the street. Similar for small children; doors open "rearward" so they can get out, go to safety, instead of even towards the street briefly to close door and go around.
At home, long curved drive to small garage. Nose in is just impossible to back out of. Might have to buy a new car.
Home, most parking lots, most streets, etc it is known to be MASSIVELY safer. Rarely is there a person standing in an empty parking spot, much less high speed crossing traffic. You back in — using mirrors or cameras to align more precisely BTW, and the trailing-wheel tight turn radius to align in one go — but pull out forward, the way people expect cars to go, with headlights, full visibility, and no need to stop and change directions once out so are at less risk of being a zero-speed object when pulling onto roads.
(Also why people "pull through" in many parking lots and why being told that is bad is dumb. It's just always-forward movement. A handful of parking lots I have been to have angled in parking in ONE row, so you pull forward to park, then pull forward to leave. Brilliant!)
Just yesterday:
People nose in can't park between lines either. Or they deliberately park across two spaces to keep others away because we no longer live in a civil society. Backing in people are no worse, and do the park in not a spot or across two spaces on purpose at the same rate, as far as I can tell (anecdotally).
We treat driving as a right so don't train at all, don't test well, and don't ticket for pretty much anything. Want a dangerous thing I hate: the de-facto okay to park on the wrong side of the street thing that has taken over. Now cars start and pull out, drive half a block on the wrong side of the road! But that's fine now in our lawless land.