Honestly ... yes. On a small ebike or scooter, commuting with automobile traffic, an accident where a helmet will help you seems likely to come from a car not seeing you and hitting you at speed - more than 20 or 30 mph. The kind of thing that's going to put you up on a windshield, or at best send you tumbling in an uncontrollable way (I'm thinking a car making a right turn across your path where you don't have time to stop).
This applies even more if you're a cyclist who doesn't stop for stop signs or red lights. Not saying that you personally are one of those, but you know they exist, and such people would be well-served by a proper helmet helmet instead of a styrofoam skull cap.