The second thing is actually pretty easy to answer. The same people from the first part of your answer have also been using their outsized power and influence to erode the power and influence of unions over a time. Many actions taken by European unions would be considered illegal in America and met with violent state oppression. While Europe has maintained many of their labor rights from the turn of the 20th century, America’s labor rights have been rolled back to almost before the new deal. Most unions barely have the right to strike, and even when they can that power is exceptionally limited. Basically any effective labor action in the US would require people to accept that they are breaking the law, and will likely die, sustain life altering injury, or go to jail for it. Since most Americans that would benefit from strong unions are living in oppressive poverty to begin with they either see the risks of illegal labor action as too large, or have been propagandized against it.