Outliers again

The number of people advocating for universal health coverage in this country over the past 20 or 30 years has been small.
The majority for many years either opposed them or did nothing.
The majority of Europeans are supportive of the national health programs in their countries.
What did the majority who opposed universal health care in the US have in common with tha majority of Europeans?
How did the American activists/outliers differ from the majority of both Europeans and Americans?
If the majority of American are now in favor of single payer program, what made them to change their minds?