Tampa Bay Times has done a couple articles where they talked to his old neighborhood friends. According to the Times,
"Court records show a domestic dispute between his mother and father in 1997." HD would have been apprx. 4 yrs. old. Article says friends knew this parental dispute 'almost led to divorce".
The article also says his friends state "he was often watched by his older sister".
Could HD have been a modern version of a 'latch key' kid? Mother and father busy establishing the beauty school,
kids left home alone with sister in charge.
If there was long term discourse in family and financial stresses as we're led to believe, maybe his childhood was
not all stable and rosey.
Article also says friends say he was more aggressive, edgy and had rage in his eyes when playing basketball with them since he came home from college.
My opinion is that his spiral downwards and failures in his life goals and possibly street drug use led to his intense anger and he acted out on it.