As a pp already pointed out, this has no bearing in what we are discussing. Normal pull in, back out parking, reverse angle parking and parallel psrkipa ALL involve backing up.
Reverse angle parking is safer because it has people backing up into spaces that are the least likely to have a pedestrian, bike, other moving vehicle in them and the pulling forward when entering those other more high traffic (including bike and foot traffic) areas . Thus, you might cause some cosmetic damage, but you'll be far less likely to injure or kill someone.
Personally, I am not the best at tight spaces in a car. I know that about myself. So I buy cars with sensors and cameras and avoid parking garages that are very confining. I'll walk an extra km to park where I know I'm comfortable downtown.