Ethics are bind to what one consider or not "right" within a given cultural background.
You clearly didn't read the text I indicated you and keep repeating something wrong. Basic ethics can be logically determined, do not confuse it with personal values.
Everything is relative, the belief of "absolute truth", "absolute evil or goodness" is actually the root of all extremism and fanaticism.
hehe, if "there is no absolute truth", what is this sentence itself? It can't be an absolute truth itself... meaning that in certain situations, the sentence "there is no absolute truth" is not true. But if this very sentence if false at any situation, that means that in this situation there is an absolute truth, making the sentence false always.
Absolute truths do exist.
As for radicalism, keeping the "status quo" can be a radical position, moderation isn't measured by "reaction = moderation / revolution = extremism", moderation is measured by awareness that despite you need a route to follow (a set of conventions we call "right and wrong"), the others' point of view isn't "just wrong" because it's different of yours.
Wow, now radicals want to maintain the status quo... basically you're defining radicalism as what suits you better.
From the very
dictionary definition:
radicalism (uncountable)
Any of various radical social or political movements that aim at fundamental change in the structure of society
As I said, those wanting to abolish slavery in the beginning of the 19th century were extreme radicals. What they fought for was a fundamental change in the structure of society.