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Isaac Arthur recently did an episode of his podcast about this possible solution. I highly recommend his content in general, he has many episodes devoted to the fermi paradox. I personally don't believe this is very likely to be the actual answer, but the discussion is still interesting

I have a different theory: considering how far away the closest planet with life probably is and assuming life on that planet started at a similar time as life on earth ( not from that perspective of earth but from the universe at large ), could we actually already observe the relevant changes to the planet that we could observe from our distance or is life just not yet observable due to the distances and times involved in observing other interstellar planets?

Okay but isn't the point that our planet and our sun aren't the first ones ever? Like, solar systems exist and have existed billions of years before ours, so why wouldn't there be life older than ours all over the place? Why assume life started at a similar time?

Violence = Extinction. We do have a tendency to kill each other, and our many various descriptions of death are merely ways to either blame or justify the killing.

It's been scientifically proven why all the (more peaceful,btw) Neanderthals are missing. We humans murdered the ones we couldn't breed.

Because so far (as far as I know) we haven't found any sings of life from these very old star systems and because I went with the assumption that prior to the start of life on earth, the conditions in the universe would have been to bad for life to start development anywhere else. Also I formed my theory with no professional research or knowledge about the functioning of the universe and the formation of life and just based my theory on the odd YouTube video on the matter and my school education.

Given the huge distances in space between galaxies we’re not looking at imminent extinction even if we’d have found extraterrestrial life. The distances are measured in light years, remember?

I’d say life+time, not intelligence+technology equates to that. Do mind that while the military handles arsenals great enough to destroy the planet countless times over, people’s average life expectancies have increased with time. Quality of life, too.

Now if only we would collectively make an effort to put all that progress to sustaining life instead of capitalising on its’ protection or repurposing resources, we’d have Star Trek, not lifeless valleys.

We’ve already got a spaceship capable of sustaining life for so long as the sun doesn’t burn too hot and shifts the solar system’s habitable zone, it’s called planet earth.

It isn't a paradox for two glowsticks in the ocean to not see each other.