Yes, I agree those factors probably contribute to the fact that the US experiences far more school shootings than any other country in the world, but again while far more infrequent, there still have been school shootings in Canada, Australia, Europe, and many other places.
Keep in mind that I'm playing devil's advocate here, but if we were to fix the things you mentioned: toxic masculinity is erased from the public consciousness and the government gives free mental health support to everyone, can you guarantee on your life that a school shooting would never ever happen again for any reason? Simple yes or no answer to satisfy Mr. Vance.
The post mentioned a wireless mesh network, so it sounds like the ISP/provider already has a bunch of wireless access points set up to cover the whole building. One of the problems with high-density living spaces is that there are only a limited number of communication channels WiFi can use, so if everyone living there also runs their own wireless networks they use up all the available channels and have to cross-talk over eachother, leading to everything slowing down.