I guess I'll start and see if I can help this discussion a little.

For starters all people who kill think they have the right or the reason to end a persons life, but their reasoning always comes from some disturbing or enligtening event in their life.

For Voldemort he discovers is father was a muggle and being enlightened in the Slytherin house that muggles were foul beings and this insight is truly what made Voldemort want to kill his father and muggle people in general. If Voldemort was not put in the Slytherin house do you think he would have learned muggles as disgusting beings. Not to mention with all the bad people that formed their pat in life from Slytherin values would it have helped to have intervention within the Slytherin values to try to instill better values, by teaching them early on te consequences of Slytherin values.
:power, pride, and discrimination, will lead to a very lonely life.

For Voldemort having Sytherin values power was everything, he wanted to rule the world forever and did what it took to attain that goal. Do you think Voldemort had a clear idea of what living forever truly meant, most people could never bare it, but Voldemort never had feelings for anyone but himself, or did he mabe care for his followers? One thing is for sure Voldemort was either mentally disturbed (not having feelings for anyone but him) or did not tink things through. Either way his humanity was the price he willed to pay making horocruxes splitting his soul at the expense of another. I don't think Voldemort made horocruxes because his mother had died even thoug she was a wizzard.