.. and never trust guys with beards ;-)
The popular antidote to this umm temporal malleability of something so deucedly difficult to grasp as, Treating People Decently (an admittedly highly complex involute concept): is most often nicely handed-off by reference to one's Guide to Objective Morality.
(Currently we appear to be living-out the various One True Objective Morality (s) as each group attempts to demonstrate its wisdom, tolerance, forbearance and just plain Humanity, via duelling Firepower.)
Given this state of affairs.. I think I'll just read another Discworld adventure. Instead. The Objective Morality implied by the writer .. but left to the reader to discern .. somehow appears a better Source than the hoary texts of the above miscreants. (Those obv haven't Worked for a full calendar year since the ink dried.. and no matter Who's calendar you go with.)
Damn it's tough evaluating a species you imagine you might somehow 'belong to', yet - -