The standard is easy to define, through a basic application of logic. Go and read through that thread again, it's all explained in great depth by several people.
Just as in mathematics, simple logic allows one to examine all variables in the moral equation and extrapolate from them a ruleset by which moral behaviour can be quantified.
[FW] Spider AL
Hewwo, meesa Jar-Jar Binks. Yeah. Excusing me, but me needs to go bust meesa head in with dissa claw-hammer, because yousa have stripped away meesa will to living.