"A lack of something can be a motivation to action, and thus a cause in personal behavior. It happens everyday, to both of us. I dare say to everyone." -- Well, that is a blanket statement of your own. I would love an example. You can't use lack of money, because that is 'something' - it is an emotional drive, whether it be wanting or greed. I can't think of anything else you could even try.
Detrimental to whom? -Everyone in the tribe. You either lose a hunter or a worker.
"You can in nowise prove this proposition as a universal." -- I never use the term universal. That has semantics issues on its own - used to reference a divine morality.
"But if society is the judge, what have we to say of societies that condone what you and I might label murder?" -- Again, I never said society is a judge, it has nothing to do with society....or judging. But, using your assertion - then the United States is such a society. We are an immmoral nation. And, given we are the most religious nation on earth, and the most Christians by far -- what does that say?
"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot."--Mark Twain