Any civilization that cares to travel to you to make contact is very likely expansionist. Or at least may have some plans on the space where you happen to dwell.
It doesn't even have to be likely for it to be a worry.
Imagine there are 1% chances that an encounter with an alien civilization spells the end of humanity.
Or 0.1%, or 0.01%
Now roll that dice for millions and millions of years. It's probably a good idea to switch to communication technologies that don't broadcast your location (and your technological unsophistication). Just in case.
Imagine there are 1% chances that an encounter with an alien civilization spells the end of humanity.
Or 0.1%, or 0.01%
Now roll that dice for millions and millions of years. It's probably a good idea to switch to communication technologies that don't broadcast your location (and your technological unsophistication). Just in case.