There is no excuse for forgetting you are a parent.
So let’s put them in prison.
this happens very rarely. Around 15 times a year in a country of 300 millions. It Is almost always accidental.
No one excuses it, certainly not the parent that it happens to. I can only imagine the incredible guilt associated with this. That being said. People are people. They are imperfect. Some of the most perfect people are imperfect. I am sure you have made terrible decisions and forgot many important things.
We all make mistakes. Most of us are fortunate enough that our mistakes don’t end a life. Some people are not so fortunate.