This was because eye-level bumpers tend to decapitate people during pile-ups... since they are, after all, eye level...
But not for a vehicle that carries one person
But a tall profile does not mean that headlights need to be mounted higher above the road surface. This is a simple problem in geometry.
Plus I'm not even sure the general statement is really that true. The El Camino was a regular car profile. If you're just buying a pick up to haul furniture around rather than, say, bales of hay you don't need it to be that tall.
The only thing in the US that is different is that passenger vehicles don't have as strict of pedestrian standards as the EU.
I'm just saying: a semi and a lorry have the same pedestrian-unfriendly profile.
The typical counter-argument to that involves some sort of abuse of the notion of freedom.
(Not endorsing, of course, just mentioning it.)
https://www.iihs.org/news/detail/iihs-recognizes-semitrailer...
https://www.mentalfloss.com/article/28155/how-jayne-mansfiel...
https://youtu.be/kgcAA4HUxuE?t=229 https://youtu.be/kgcAA4HUxuE?t=388