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Well I asked /lit/ but no one knew what it is so they told me to try to ask here cause "it's the most popular Humanity fuck yeah story and you probably will know what it is" so here I am.

I started to search for some sci fi stories that I liked and I can't find one particular maybe you can help me?

I list things I remember.
- There was this one civilization watching another through telescope or something like that
- This watched civilization acted like barbarians murdering each other or some shit like that, many wars atrocities etc
- Watching civilization came to conclusion that if this watched civilization go to the stars it will spread war and death everywhere killing billions
- So this watching civilization created a powerful bomb and send it towards home planet of this barbarians, this bombe goes faster and faster reaching speed of light or something like that
- Years will pass before bomb reaches them and destroy everything in their solar system
- During those years this civilization still watches the other and something starts to happen, this barbarian civilizations begin to evolve or some shit and is starts to become something unique beautiful that you can respect etc
- But there's no way to stop the bomb and it finally reaches them and BOOM obliterates everything
- Civilization that was watching this barbarians which became something beautiful regrets their decision about sending the bomb
- But "barbarians" survived and they know where are those that destroyed their world and they will find these people and will take their vengeance upon them

It's short story, barbarians were implied to be humans and it ended with something along the lines:
"We know where you are, we're coming for you" or something like that

Yeah I spoiled everything but still I want to read it again, it was one of a kind.