Because they think it's easier to ban this device than to require auto manufacturers to produce secure locks. Also, people keep voting for them so they don't think they're doing anything wrong.
That's assuming that the technical problem, testing, rollout, etc. wouldn't run into any issues.
That all said, not all thefts are the kind that the Flipper team are describing (/the kind that the government is falsely blaming on the Zero). Lots of them are a lot simpler than that, even before getting to the Kia/Hyundai mess.
Actually making the mass car theft problem better would require a more in depth approach across several boundaries, and that's a lot more effort than just banning this tool.
This might be doable but the authentication path would need entirely separate and dedicated circuitry.
Or maybe a cryptographic stream that is like a cumulative handshake (incremental streamed challenge/response?) that can offset some of the processing delay.
Any solution would need to be faster than nanoseconds because that's how long it takes light to travel a meter or two.
Looks like they do channel impulse response analysis with really high data rates.
Very interesting stuff, thanks for sharing.
1. Competent police agency reverse engineer how relaying hardware works and how can such devices can be detected IRL.
2. Police sell relay device themselves and catch thieves red handed.