That's true. But it is also true that, in some of those countries, people fail to follow those rules. For a worst-case example, the Delta variant in Argentina was traced down to a man [1] who ignored the self-isolation rules and visited shopping malls and a restaurant.
I can be probably persuaded that some specific regions can do well with voluntary quarantine. But I'd rather trust the local authorities to know what the best approach for their people is.
Even Norway had lots of cases tracked to people breaking quarantine, after which police started checking up on them. I’d say an argument for not enforcing the quarantine in the hottest phase of a pandemic is in effect allowing such events to compromize things. Maybe you can argue for that, but we need to at least be clear on this detail.
I can be probably persuaded that some specific regions can do well with voluntary quarantine. But I'd rather trust the local authorities to know what the best approach for their people is.
[1] https://en.mercopress.com/2021/08/23/case-zero-of-delta-vari...