As a Dutch cyclist I would certainly use a helmet on American roads (or not use a bicycle at all). Furthermore, in the Netherlands the delivery drivers that use bicycles are asked to wear a helmet by their employer. Riders of E-bikes that are able to accelerate without pedalling and those that are able to accelerate above 25 km/h are required to wear a helmet by law. I'm certain that the majority of the Dutch would think it is completely insane that a delivery company is prohibiting the use of helmets on their E-bikes, even if it was in the Netherlands.