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@Tarik
This is how the scrutinizing of ideas works. You try to break them with logic and science and whatever is proven wrong or unfalsifiable is dismissed as likely untrue. That is how logical validitation works.
IF you MUST either objectively prove objective meaning OR you should immediately stop caring about all human life including your own AND IF you cannot objectively prove any objectuve meaning THEN regardless of any actual objective meaning your INABILITY to objectivively prove it NECESSARILY means that you should stop caring about all human life including your own.
This is my best understanding of your most basic argument although you haven't been structuring your arguments very neatly so I cleaned it up a bit. If that is problematic feel free to rephrase but if it doesn't change the basic meaning then I DON'T CARE. I am not sifting through more than a thousand posts though you are welcome to especially if it significantly changes your argument.