Many of these ways are promoted by people without any experience fighting, struggling, or even being competent in exercising, in my experience.

Were it so simple, police forces would simply act out Hollywood-esque movie moves. But in reality, individual officers must often resort to firearms to stop assailants, or in some countries, mass unarmed officers must swarm a single assailant.

In regards to states' self-defense claims, they have every incentive to claim it as a casus belli. It's too powerful and righteous to not try to get it to 'stick', and big lies do sometimes work. That doesn't obviate there being actual cases of self-defense, it's just not something that can be taken for granted, and when information is a battlespace all its own, I guess we shouldn't be surprised.