"An it harm non, do as ye will."
-- The Wiccan Rede
I am not Wiccan, but I have found nothing better as the basis of my morality. Sounds simple,think. Sounds like one would have a lot of fun and freedom.
Think again. And again. For the saying to have any meaning at all in application, there must be lots of thinking before acting. One must try to anticipate whether any significant act is likely to cause harm to another.
Moralities that are just a list of rules are the easy ones. Only follow. No thinking required.