When the diagnosis is SIN; NO political 'medicine' is going to cure the patient.
"Sinful" behavior is much more prevalent in Europe than the USA, yet they are "making the turn" in the right direction.
A more likely explanation is that it took longer to move an entity the size of the USA "leftward", so it will naturally take a bit longer to re-align "rightward", and that the USA started that "leftward" turn much later than Europe.