How does this happen?

I always wanted kids...lots of kids. As it happened, we stopped at four. Twenty years after the first was born, I am glad I did. I am not a very good mom apparently. I have raised a child who apparently has no regard for the feelings of others most of the time. Which of my offspring I am referring to will rename nameless simply to protect others around us as well as the individual from judgement. I will even refrain from using a gender that may give it away. What bothers me the most is I thought I had taught all of them to think...to consider everything before jumping in with both feet. Apparently I have failed. What could be next in this child's line of mistakes and who else might suffer at his/her hands? I don't want to stick around and find out to be honest. If there is a way to detach myself from parenting, I must find it soon.