While I do like dunking on ammosexuals, the reason that the US isn’t at the top of this sport is that the popular pistol shooting sports, in the US, are different. The US shooting sport community is more focused on action shooting styles of competition. Trick shots, speed shooting, target accuracy while moving/on moving targets, in close combat simulations, etc. Also long range rifle marksmanship, and alternative shooting marksmanship like air rifles.

If you look at the history of things like skeet shooting, very long range target shooting, air rifle, and a few other the US does very well.