Yes, they do seem to have a much more reckless mindset than we here in the UK do, despite the crowded beaches here. I note that in some states (notably Texas) there has been another massive spike since lockdown was lifted. Other states like Montana, have barely been affected at all, even from the start - perhaps reflecting smaller towns and a more rural lifestyle. Montana borders Canada (population 37.6 million, and 8000 covid deaths, so in absolute terms and proportionately, much less than ours).
Interestingly, the latest US spike is affecting a much younger cohort than previously - predominantly 30's this time.
Here in the UK we do have our problems with morons who flock to the beach in large numbers, and the illegal raves, but at least that's outdoors, and hopefully the strong UV light will be mitigating the virus, on the beach anyway. Also, as far as I can tell, we don't (so far) seem to have been adversely affected by the previous waves of beach goers from several weeks ago, nor by the demonstrators. I did notice many of those demonstrators wore face masks, as did those who stood in front of statues to protect them.
I wonder how the spike in Leicester will be dealt with.