Not that I agree that an armed population is the BEST way to avoid tyranny, but saying A helps avoid B isn't contradicted by saying 'we don't have A or B so that can't be true'
British tyranny sounds pretty polite, I'm not sure shooting anyone over this would really be considered an improvement.
I mean someone did actually shoot and kill someone over just suggesting that people should vote in a certain way, and he's generally considered the bad guy in this interaction.