Who should we really be labeling insane here, the man trying to make things safer around him, or society who feels they can text, talk, and drive while attempting to control a ton of steel down the freeway at 80MPH?
Your question is phrased poorly, as those are not exclusive options. The answer is that both are idiots*. The first for thinking that a jammer is an effective and appropriate method for increasing safety, the second for disregarding the safety of themselves, their passengers, and those in cars around them.
* insane may not be the appropriate word here, calling people who drive and text insane is an insult to genuinely insane people.