1. Occamism: the simpler a moral theory is, the more likely it is to be true. Hence (a priori), the most probable two moral theories are that (a) everything is permissible or that (b) nothing is.
2. Majoritarianism: an action is morally right if and only if the majority of conscious beings capable of understanding that action and its consequences think it's right.
3. Restraintism: if you have the desire to do something, then you don't get moral credit for doing ...
More
