Cory, that is a truck. Yes, it's a stupidly oversized armored military truck that serves no purpose in a police department except as a penis extension, but it's still a truck. This is not a minor nitpick. It is no more a "tank" than it is an aircraft carrier.
You know this. You are a smart guy, you are a fantastic writer, you know that words mean things and that word choice matters. And you've done this kind of thing many times before on this site*, in clearer circumstances even than this one. That means you're not just mistaken about a point of vocabulary, which would be fine even though my pedantic side would grumble. You are making shit up to try to get a stronger emotional response from your audience.
It's insulting, man. We're supposed to be the rational ones, the evidence-based ones, the ones who can deal with the plain, unadorned truth. Show us the facts and trust us to come to a wise conclusion.
And worse than that, it feeds the perception that progressives are a bunch of shrill, manipulative jerks. It makes people who might be on the fence, who might be amenable to reason, more inclined to say "those stupid liberals don't know what they're talking about, don't trust them."
Please reconsider this approach. I'm asking you as a fan of your writing and of your politics. You're better than this.
*I'm afraid I do not have citations handy, because I am not quite feeling stalker-y enough to start keeping an "Errors Made By Cory Doctorow" journal.