[Saurreg]

Perhaps the dwarves are most akin to men in mind and spirit and that free-will is something that both races share. We have seen examples of dwarves performing what we consider as "good" deeds and now you have refreshed my mind and provided new knowledge on how "bad" they can be.

Good and bad are arbitary terms and percieved differently by different people with different agenda. So I would say that the dwarves will always look after their own interests and interact with other organisations in such a way that the morality of their actions would be percieved as bad from the opposite side or by the reader who is subjected to Tolkien's regime of what is right or wrong.