I think of morality more as a natural result of actions and reactions within a system. I don't think of it as an absolute, but relative to both situation/conditions, and perspective of the moment. The "system" I'm talking about is the universe or multiverse if you will. However, to simplify lets consider a smaller system the human body. Within the system of the human body there are various organizations of life forms existing within. Some kill and reproduce. Some just reproduce and build. You may think of some as being destructive if you were to zoom in on their little world and only watch what they do. However, zooming out and seeing the system as a whole you may see that their seemingly destructive actions may actually provide for the overall health of the entire system.
I think that a system in general wants to be healthy overall and we might say that actions that contribute to the overall health of the system are the most moral. However, for any one part of the system to "know" whether what they are doing contributes to either the overall health or destruction of the system, they need to expand their point of view somehow in order to communicate with the other parts or the system as a whole and get a better feel for their overall place within the system. I think when a human body is in a state where all it's systems are well connected and communicating, the health of the overal system of the human body increases... and when parts of that body become more disconnected and communication is constrained or cut off, then individual members of the system (cells/organs) begin to have a more destructive impact on the system as a whole (perhaps cancer is an example of this).
Perhaps the universe as a whole is not so different. I think perhaps morality is determined by whether our actions on the whole or greater picture tend to promote health toward ourselves and others, or they tend to cause sickness, and destruction. As we see in the human body, some pain, death, killing, etc can actually be beneficial to the whole... and obviously I think intention has something to do with that as well. However, I think that to establish set in stone laws governing morality is the easy, short sighted, narrow/simple minded approach to a more complex process or system. People are always trying to make things as easy and simple as possible... but some problems can never be so simple, and to try and simplify them does not do them justice or promote the best health of the system overall.