r/FermiParadox

Time travel and doom theory.
What if as time travel is discovered by worlds/Aliens.. the danger of time travel ie ending your civilization always eventually happens and when it does because it involved time travel and you erasing yourselves its like you never were to us because we are in our own timeline bubble where the other Aliens never were because we have not reached when we will never be?
John Siegel and I really want someone's opinion