>when you realize a society without borders would be 6 billion people constantly migrating to where the most money is, sucking it dry then moving to the next continent/nation like a bunch of parasites ad-infinitum until all resources are dried up and society permanently devolves into the neolithic stage never again to advance beyond stone age tech where everyone lives in misery once more until the next cataclysm wiped us out once and for all.
>we also would have likely trapped ourselves on our planet and dismantlement all our space programs on purpose, public reasoning is to "pay for all those poor migrants", the real reason it to stop humanity from exploiting the solar systems vast resources and keep earth in a scarce resource state in order to better hold power over the population
Just nuke everything