No alien civilizations have substantially colonized our solar system or systems nearby. Thus among the billion trillion stars in our past universe, none has reached the level of technology and growth that we may soon reach. This one data point implies that a Great Filter stands between ordinary dead matter and advanced exploding lasting life. And the big question is: How far along this filter are we?
I think the first sentence in the conclusion has problems. Why the hell would you assume, "No alien civilizations have substantially colonized our solar system or systems nearby."
I think I know why, we are stupid enough to think we are capable of understanding life that is more advanced than us. A sufficiently advanced entity could hide on our planet if it wanted to!