9
it's also presented as something really hard to do. you have to not only disable safeties and force the thing to operate at unsafe levels, then physically damage hardware. kai had to have a passenger literally pull control boards in the cockpit right before ejecting the head, while Dan allard was planning to let his mech be shot up to the same end. and in his case he was gambling that he'd get the result we wanted, it wasn't certain.
the only sure way to get the result is to install boobytrap hardware. but as mentioned.. except in a handful of cases like the bullet drone, its usually way too expensive for what you get.