I used to work for a company that made you feel like you were the worst person ever if you made any mistake whatsoever. I remember one guy being called out during a company meeting and reprimanded in front of everyone by the boss. It was horrible. Towards the end of working there I did not want to make any changes other than very small ones for fear of messing something up and getting yelled at in front of everyone. Even though I was encouraged to learn and apply new things, I never would because if I made an error during the learning process, I would be chewed out, meetings would ensue, etc etc.
My current company knows that mistakes will be made sometimes and they need to be fixed. Once they are fixed, learn from them. My department keeps a log in our wiki of things we find and how they were resolved so we will have a running log of them. I am much more relaxed here knowing that if I try something new and it doesn't work out, I won't be scolded and humiliated in front of the whole company. When someone does drop the ball, it really depends on what it was for what action needs to be taken.