I think I was rambling too much last night, but until I sort it out in my head, I keep thinking about a question/issue/etc.
Back to the question of convictions and absolute truth and questioning:
I think we should take a slightly less emotional problem to discuss the relativity of convictions and their dependence on the prevailing culture.
If we look at the care for the elderly and disabled, for example, we see that now the generally accepted morality straits that the elderly and the disabled should be cared for and inter grated into the society independently from the fact whether they can “give” anything back. It is moral, it is right, it is our conviction.
If we look at the same group of people in the, say, a tribe of Yakuts 200 or so years ago, the elderly who lost through age and/or illness their ability to contribute to the society (the tribe), would be left with a small parcel of food on their own and the tribe would move on. And it was moral and right for that time. See here
Yakuts (seminomadic tribe in N.E. Siberia) used to keep the old as slaves and often beaten by the sons. Among the Chuukchee (Siberian tribe) it was a custom to hold a feast in honour of the old followed by throtting to death usually by the oldest son or younger brother. Esmimos of Greenland used to persuade the old to go and lie in snow and wait for death or throw them alive into the sea after a feast. In Japan, some primitive tribes used to consume glands and flesh of distinguished elderly in their belief to rejuvinate themselves. In some parts of Japan there was a custom among some tribes to hold ceremonial feast every three years followed by deportation of the old to a sacred mountain to die eventually. In Fuji, primitive tribes used to kill themselves and it was a custom among the Dinka tribe in Sudan to give live barial to the old. In Japan, even these days certain communities symbolically expel old age people from their midst. In other cases old men were actually burnt alive. In Bali it is said that once up on a time, people of a remote mountain village used to sacrifice and eat their old men. A day came when there was not a single old man left and the traditions were lost. Most usual, choice of communities with inadequate resources, whether they were agricultural or nomadic was to sacrifice the old.