It's going to be pretty hard to make micro-drones with EMP shielding. Jamming devices are also going to be useful against drones. The best way is to build like-minded communities and secure those communities well. It's proven that gated communities have less crime and violence. It's not going to keep you safe from a full blown invasion/terrorist attack. But it is the best you can get.
Even STEEM is a great example. Think about posting something like this on other social media: https://steemit.com/comedy/@vimukthi/revisiting-trudeaueulogy-some-of-the-best-political-satire-ever
Most people here have free market libertarian values and we support each other in many ways. That's the best defense against any war I can think of. Also read: https://www.caseyresearch.com/doug-casey-phyles/