the ones who prospered were the most aggressive ones, even conquering the whole world by force, it's a survivorship bias situation.

not every group of humans is aggressive, but those eventually get conquered by the agressive ones, military power always ends up winning.

It's unscientific to say that any country, given the chance, would do the same as the europeans or the US empire did to the world.

At least the Chinese century will prove or disprove this theory, given it's the first significant power shift in the last 500 years, let's see if they will be so brutal as the US and its allies (you know who) are to the world.

I firmly doubt it, there are no signs of brutality to other nations coming from the chinese, at most you could argue of some internal issues. There are no invasions, war or regime change operations done by China yet.

As someone from the global south, I don't fear China or even Russia in the least, I only fear what the US or Europe will try to inflict in my country, like the recent regime change operations that I lived through, that was pretty harsh.