I'v been trying to construct a wholesome personal philosophy from scratch for a few years now. Unfortunately I haven't gotten much further than the basics:
"There is nothing a living being could ever do to deserve death" and "Killing isn't always wrong, but it's never right"
I'm obviously steered by other morals, but they're the ones I grew up with, and not ones I cam up with myself. I'm not convinced I can fully justify them with logic a reasoning, as much as I can my own personal philosophy (Working on it though).