smaller, weaker beings

What do you think of this statement?  Anyone have thoughts?

"There is something in the most inhumane part of human nature that enjoys hurting smaller and weaker beings, particularly if they annoy us or make demands on us."

This was said by someone with ADHD.   It has been haunting me ever since I heard it.  

It seems dh does "get a charge" out of inflicting chaos and doing things "his own way" even though it is affecting someone else to be uncomfortable and uneasy. Is he doing it because he is unfocused or because he enjoys hurting smaller and weaker beings?