it is actually one of the few really good strategies if you want to take over an entire already populated and heavily armed planet. Of course it will take some time, a couple of decades, but at some point if you land your hefty 5km long starship in some god forgotten place, probably the shaken remaining societies won't even bother to shot some nuke at you.
hm.. no, I asked to imagine more crazy thing — that all antiviral measures are so crazy not because of world govts are crazy but because they are training us for this invasion