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Dude, while stromatolites are not common today, they are not unheard of. There are still some active ones in Australia, Peru and the Bahamas. Every single thing on this planet can trace a direct line from the first live when it evolved. Thus, everything on this planet has the same age. Even if a fossil could suggest that some organism has not changed much for millions of years, we can not look at the cells and their genetic makeup to infer if other significant changes have occurred not reflected by the fossil remains.
Thats his point. No need for genocide if other options are available. Many many Germans supported the Nazis and denazification after ww2 was a thing