AM radio is most useful for its resilience in the worst case scenarios and for its reach to underserved populations. It benefits from comparative simplicity a

AM radio is most useful for its resilience in the worst case scenarios and for its reach to underserved populations. It benefits from comparative simplicity and longer range than FM. It can also be trivially connected to digital modes for even longer ranges and reliable data transmission. Crude receivers can be made from readily available materials and require no local source of power. Maintaining a national network of AM broadcasting stations by ensuring economic viability is a low cost method of ensuring communications resiliency for the nation under the worst of circumstances. I can’t say for the difficulty of filtering EMI from EVs, but assuming that a vehicle already will have some kind of audio system, AM radio is a <2$ add to an existing radio receiver. Think of it as a 2$ per car one time tax to ensure improved worst case CCC capability for the nation in the face of the most acute threats to the population.