Lazy is more or less accurate; It is a fucking chore to get to exactly where you are trying to start. I think it's important to start from a point of realizing that the end result doesn't have to be absolute, in the sense that not absolutely every possible situation has a 100% answer, but that doesn't mean it doesn't have a better or best answer that can be reached logically; also you don't have to be a "value monist" with one ethical value being the guiding principle that has the final say so, I think you can break down ethical issues into rights, justice, utility, and care, and they don't always agree, but rather need to be weighed together in some way.
You can break down each of the 4 concerns: What are rights? Is justice objective? Etc. If you break down each of the 4 individually you get a long way towards your answer.
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