Any nation which practices this lesson will quickly run out of executioners and tyrants, or they will run out of it. The disarmament of law-abiding citizens is the required precursor to genocide. Registration of people and firearms is the required precursor to the tyranny which permits genocide. Bureaucrats cannot send soldiers to doors that aren't on their list. Believe actions, not words.
Tyrants are consummate liars.
Reference Adolf Hitler, 1932. And just because a would-be tyrant mouths words of reverence to law and justice, or takes a solemn oath to uphold a constitution, doesn't mean he believes such concepts apply to him. Reference Bill Clinton, among others. The language of the lie is just another tool of killers. And keep your rifle handy.