Okay Issi that's like 30000 years in the past.
Let me say it a different way: you're still pretty squishy according to the records. Do you go out running around in Perpetual Wastes? No probably not. Why? Those borgs would abuse you and throw you all the way back to a reclaim terminal in Rome.
Now when you're hanging out in Rome or in your city, do the Mantis monster from PW search you out and start picking at you with their nasty claws? Uhm no.
So now us neuts. If we don't want to die do we go to Tir? No. Does Mr. Silverstone come to Borealis or Newland hunting us? No.
Same thing.
Oh, and genocide is an attempt to exterminate an entire group of people. All Mr. Silverstone wants is to keep people out of tir (whether right or wrong). If he was chasing after us all over the planet and into the Shadowlands then maybe but he's not. He sits in the sun in Tir and is happy with that. He doesn't want world domination otherwise he probably would have tried it already.