If you use bad seed, your yield come harvest time will be wanting. Such is the case with the late John Lennon.
From a 1998 Telegraph story. Here's a quote from Julian Lennon. " I have to say from my point of view, I felt dad was a hypocrite. " Dad could talk about peace and love out to the world but he could never show it to the people who supposedly meant the most to him : his wife and son. How can you talk about peace and love and have your family in bits and pieces--- no communication, adultery, divorce? You can't do it, not if your being true and honest with yourself.
John Lennon's father left the family when John was 4 years old. He blamed himself. And never got over it. He mirrored his father in his treatment of his own son. He chose to do it. So something bad happened to John and he knew it. But he didn't know how to handle it. Therapy might of helped with him. But it became ingrained in his psyche. He did no future introspection. To look within is hard but necessary to have a better life for yourself as well as others around you, in his case his own son. How sad indeed.