Why there are people who have a tank parked on their garages? Must they think that it is best than a watchdog? Nowadays, it is not a weird situation to have a gun at home, even a shotgun, but having a tank? What the hell!
Evidently, that in some circumstances it can be useful, especially for frightening thieves going around your home, but it is not a normal thing that you can have, more typical for a museum than for a decorative object at home.
And it is true, that some people are not awareness that they have a big weapon at home, thing that can scare their neighbourhood if something mortal take out of the machine.
Another thing it would be if a war started and the government asked you to participate as a supporter on the cause; even, if you refuse, they could confiscate your tank because of cuts in the army.
It is not a big idea to have a tank parked on your garage, especially because of the troubles on you can get trapped.