The problem is not that the US is sparse, is that cities are. You are probably misunderstanding the problem, and if not, you are not explaining correctly. Check out The Dumbest Excuse for Bad Cities from Not Just Bikes for a breakdown of the issue.

No one is blaming you individually, or even the US citizens individually. The problems are multiple for sure, but you won’t start to fix it unless you understand the issue properly. Maybe it’s not your case, but many US citizens are surely not seeing the point at all.