I guess it isn't that big a stretch to use such defensive language, there are a lot of things that can be tampered with on a vehicle that arise out of engineering trade offs.
I don't mean to dismiss the problem at hand, but it is only an issue if someone makes an effort to tamper with a vehicle, which is different than a critical part failing prematurely or whatever.
That's probably the wording their lawyers asked them to use so they would not be liable for damages. If they admit fault, they're legally to blame for any accidents or damage.
http://www-odi.nhtsa.dot.gov/recalls/recallprocess.cfm
I guess it isn't that big a stretch to use such defensive language, there are a lot of things that can be tampered with on a vehicle that arise out of engineering trade offs.
I don't mean to dismiss the problem at hand, but it is only an issue if someone makes an effort to tamper with a vehicle, which is different than a critical part failing prematurely or whatever.