(If you've ever tried to get a builder in Copenhagen or London you won't start talking about construction worker wages as being lower in Europe!)
Public projects are even worse because of a law called NEPA. The law requires a detailed environmental study of pretty much every significant project, including new rail projects. Just putting together the environmental impact statement can take years. The median is 3.6 years and a quarter of projects take more than 6 years: https://www.whitehouse.gov/wp-content/uploads/2017/11/CEQ-EI.... Because these are all administrative decisions, there are numerous opportunities to file lawsuits, take appeals, etc., over pretty much any decision made in an EIS.
Any significant transit project can expect to spend at least a decade in planning, permitting, and litigation, with litigation continuing through construction. The environmental and administrative laws are so broadly worded, pretty much anyone can hold up a project for years using various pretextual reasons (water runoff, wetland management, threatened species, traffic management, etc.).
Contrast how France does things. In France, the government is a single organ—local governments are mere administrative subdivisions of the national government. Decisions get made, and whatever environmental review is needed is done, and once that is done, the legislature passes a law that preempts any other law, allowing the project to proceed without further legal challenges.
Also, I think Europeans for the most part aren’t antisocial tools. People in Chicago sued Ronald McDonald House Charities to stop building of housing for families of cancer patients being treated at Northwestern Hospital.
I mean, the US... Mostly doesn't, in the kind of city large enough for subways. Have you seen all the articles on how bad the housing situation is in places like LA, SF or NYC?
Crossrail's per mile costs are still a fraction of New York's. Crossrail upgraded 40+ miles of above-ground track, redeveloped dozens of stations, renewed 20 bridges, and built a 15-mile segment of new track (13 of them in subways) for about $20 billion. And in just a decade of construction. Phase II of the Second Avenue subway, meanwhile, is costing $3.8 billion per mile. And just the first 4.5 miles of the 8.5 mile line will have taken 20 years to construct, not including the significant prior work that was done since the 1970s.