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.

I am a Dutch cyclist and almost got a ticket for not wearing a helmet while under 18 (I was 16 or 17) in San Francisco. The policewoman was nice, though, and let me go.

Keeping in mind that American drivers aren't used to cyclists, it wasn't that bad in my (minimal) experience. But, of course, bikes are a little more prevalent there so that this experience won't stretch too far land inwards.