Unfortunately mask compliance on this side of the pond has largely been a result of government intervention:
"As rapidly growing case counts strained health care systems across the South and Southwest this summer, more Republican leaders ordered citizens to wear masks to help slow the spread of the virus. In July, President Donald Trump wore a mask in public for the first time and urged Americans to do the same, marking a change in tone from earlier in the pandemic."
https://www.pewresearch.org/fact-tank/2020/08/27/more-americ...
"A tidal wave of new mask requirements has been issued in the last few days, amid surging cases in many regions, including more than 75,000 new coronavirus cases across the country on Thursday, the most in a single day. Face coverings will be required at stores like Walmart, Target and CVS, and in a growing number of Republican-led states where governors once resisted such mandates."
"More than half the states have issued statewide mask requirements, including Arkansas, where Gov. Asa Hutchinson, a Republican, announced a face covering requirement on Thursday, after previously taking a more hands-off approach. Gov. Jared Polis of Colorado, a Democrat, also issued a mask order on Thursday, after questioning whether such a mandate would be enforceable."
"But there remains firm resistance in many circles, including from some Republican leaders who view mask requirements as a threat to personal liberty."
https://www.nytimes.com/2020/07/16/us/coronavirus-masks.html
Unfortunately (I've been using that word a lot lately), Trump endorsing masks would have conflicted with his somewhat perplexing political strategy of gaslighting his base into thinking the virus wasn't anything to take seriously.
'Speaking on Capitol Hill on 10 March, Mr Trump said: "Just stay calm. It will go away."'
'Nine days later, after the White House declared the pandemic a national emergency, the president told Woodward: "I wanted to always play it down. I still like playing it down, because I don't want to create a panic."'
https://www.bbc.com/news/election-us-2020-54172311
And, of course, then he got it, and even with the best care in the country, and cutting edge therapies not available to normal people still had a hell of a time.
If he had done a photo-op standing in front of a pallet of N95s in NYC during the worst of it there, and pumped federal cash into making sure the country was up to its ass in PPE, this election would have been a cakewalk for him. He would have looked heroic and decisive. But, he didn't. For some reason, he took a different approach. I'm not really sure why, but 2020 is just a year of head-scratchers.