No one wants or should want to allow multi tonne remote controllable surveillance machines that carry an incendiary payload as fuel to operate on their roads, let alone near important civilian or internal military infrastructure.

All they have to do is hide some remotely activated punches inside the black box battery that can start off the chain reaction. Drive into a military base at full speed, activate the punch, and cause mass confusion, chaos and destruction.

And then do that many times all at once, with helpless drivers stuck inside right before you invade an island nation you claim ownership of.