Reasoning: people are going to rely on this to save them from speeding tickets. So they're going to drive too fast. Meanwhile, other idiots who don't have it will also drive too fast. It's only a matter of time before someone in a Genesis enters a camera zone and auto-brakes while another speeding idiot on a cellphone is tail-gating them. Result: a high-speed pile-up.
Something not-dissimilar happened with the first roll-out of ABS on cars; drivers who knew their brakes were super-strong drove too fast and actually ended up with a higher accident rate, at least at first. But ABS was a pure safety feature (to prevent your brakes locking up on a slippery surface or if engaged too hard). This ... I lack words to describe how inadvisable I think it is to seek to avoid a small fine in return for an elevated risk of high-speed vehicle-to-vehicle collisions.
(The risk can be reduced if the Genesis has rear facing radar to prevent shunts, or begins to brake gently some distance ahead of the camera zone. It's also mitigated if tail-gating idiots drive cars with adaptive cruise control -- that maintains constant separation from the vehicle ahead regardless of speed. But as not all cars have the latest features it'll take an automobile generation for this stuff to spread out and become ubiquitous. Meanwhile, sooner or later, people will die.)