With what? sticks and stones?
In the EU it's getting more and more difficult to get firearms. The left is gaining more power and coming up with theories that it's not people who kill but weapons and that if we allow people to have firearms they'll keep killing each other... That said, firearms won't stop self-learning machines. How do you arm yourself against an evolving virus that lurks in the Internet and takes over your tesla autopilot to crash you into a fuel truck?