In tyrannies, armed* people give it power, armed* people can take it away.
*To the extent of having military supremacy against all other forces.
FTFY
police and military are people too
brainwashed yes, but deep down they're still human.
if you can manage to talk some sense into them and can make them not just blindly follow orders that will ruin the lives of many millions of people, and administer act like humans, you won't need a large armed army of civilian rebels.