Your source for helmets making up lots of deaths is talking about a recent increase in deaths, even though the lack of helmets has been a thing for decades. It

Your source for helmets making up lots of deaths is talking about a recent increase in deaths, even though the lack of helmets has been a thing for decades. It's not the lack of helmets by itself that's a problem; it's the combination with high-speed electric bicycles, and their primarily being used by the elderly, that is causing deaths. Yes, old people falling and sustaining heavy injuries that they wouldn't have had with a helmet is a problem, but not one that (I think) can be solved by street design. If you see that in 2018, the Netherlands had 4.7 deaths per billion vehicle kms, vs. the US's 6.9, and then consider that it's a very densely populated country where lots of traffic intersects, then I would count that as a big success.