My personal opinion is that it is dependent upon the circumstances and that people otherwise would act 'good' (in the broad, universal sense of the word, such as not killing or stealing) when instilled with the right state of mind, societal values, etc. However I am admittedly still unsure of the final verdict. Also, I understand the ultimate complexity of this argument, given that 'Good' and 'Evil' are subjective, different societies have different values, etc. Let us just speak in the broad, universal aspect of it (i.e. hypothetically).