Imagine a massive galactic community consisting of the most advanced life forms, all of whom have reached their peak due to cooperation and peace. These ideals are so common their seen as the only possible way life can advance. Then imagine them seeing us, and everything gets thrown out the window. Where literally every species in the past has followed the same growth, stone tools, metal working, combustion engine, nuclear technology, yet Humans are the only one depraved enough to go and make weapons all the time. Think of a galaxy where nobody ever thought to make a nuclear bomb before we showed up. Like, imagine that advanced species set up warp gates next to the main planets of new species for them to join the larger galactic community, but they check up on us and see the fucking crusades, and are like; "you know what, fuck it, we don't need these crazy fucks out here." Only to watch in horror as we develop out own methods of space travel, not the clean-energy anti-gravity tech they all use, oh no, instead we strap gigantic fucking rockets to small metal ships and shoot them straight up into the sky.
I really want to see a fiction where every time Humanity achieves something the collective galactic community is shitting themselves out of terror.