Berserkers kill anything that makes itself known or something just points a gamma ray burst at the cockroaches when they get themselves noticed.
Or everyone invariably falls into a virtual reality hole when they become technologically advanced enough.
I once read a story with the premise that the aliens were shocked we created all these natural explanations for things like quasars and pulsars. “What do you mean you thought you were alone? Didn’t you see our beacons?!
Freegards
In the Carl Sagan novel “Contact” (not the stupid movie), the aliens tell the earth visitors that quasars are them doing experiments on how to keep the universe from collapsing...................
The Great Filter. When civilizations become technologically advanced enough to extinguish themselves, the vast majority do so. Humankind as a species has been at that point for over half a century, and the jury's still out on that one.
Those races that can surpass their animal origins and grow beyond themselves would advance to a point where they could easily keep themselves hidden. And probably do so. It's a jungle out there!