I'm imagining a mind report in the intergalactic ether about the most isolated species on earth: humans. Attempts at contact with other isolated civilizations by the intergalactic community have often resulted in disaster, so for now, they've decided to clear a wide path around earth and wait.
But there are no such reports. Is the speculation that we are causing disasters without even knowing it?
I suppose we may be isolated because we're still primitive. So it's one of those explanations of Fermi that relies on centralized planning rather than an eco-system. Cool.
A few creatures from the planet Earth have made their way in to space and have potentially spotted our reconnaissance craft. In case of attempts to contact, attack or trade please leave the area immediately. Earthlings are so accustomed to sightings by now they attribute these to madness in those that have been in contact, they even have special institutions where they house those that have had the misfortune of spotting one of us.
This is also a reminder that isolation is to be maintained at all cost, Earth is one of the few uncontacted tribes and it is of vital importance this situation remains so they may be studied.
A hyper-cube of 50 parsecs is off limits to anybody but qualified and suitably camouflaged observers, to avoid messing up their culture the area has been electromagnetically shielded for anything but the visible spectrum of the inhabitants.
As far as weaponry is concerned a class-1 shield is more than sufficient to take care of the worst they can throw at any intrepid researcher so any kind of retaliation would be a punishable offense. "
