i believe there are fundamentally bad people, and they are largely those people who are called sociopaths... since approximately 1 in 30 people are sociopaths, it is far more common than autism and asperger syndrome (it can be comorbid with ASD).
there is a fantastic website devoted to understanding the sociopath (link), and it is really eye-opening to understand more about those types. they lack conscience and that allows them the freedom to behave however they feel like, regardless of who gets hurt.
so i gues you could ask yourself... do you care if you hurt people? some people just care because it makes a situation awkward or it prevents them from achieving whatever they want or it makes them look bad, but those types don't truly care about other people's feelings.
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