I think in this particular case the culprit, as a "licensed drone operator" who was transporting about 20 large-capacity (drone) lithium-ion batteries, should have been (and likely was) quite aware of all related dangers. This was not an innocent mistake by an ill-informed person, but rather a "willful ignorance" (for the lack of better term).
It's a mix of "I know better" and "it will never happen to me", along with being a self-centered jerk who does not care for lives of others. Can't combat that except with vigilance and excessive punishment. Since this person lied about content of his luggage - I hope there is a criminal case against him.