Autonomous is a very bad idea. For one, it can be hacked. Two, it can't make the same rational decisions a person can.
Have you heard of DARPA?and do Self propelled anti aircraft guns Drive themselves?
Which provesm my point.
Am I the only one that finds a self driving, spike droping, Built in grill gun shooting, Tear gas leaking Cadillac Limo badass?
No one can sneak an RPG into the presidents inagriation/ something else.