The truth is, wanting to harm or kill someone is a common part of the human mental circus. While there are some moral saints out there who have never wished ill on anyone, twenty percent of human beings have weighed the pros and cons of killing someone at some point in their lives. Five percent have the moral flexibility to act on the possibility.
It is true that many people have at least fleeting thoughts of violence or harming someone. It is not supported to claim specific figures like 20 % have weighed killing someone and 5% have moral flexibility to act. The statement overgeneralises and assigns precise percentages without strong empirical backing.
