No, they are pointless because their populations are large and borders porous.In hindsite, we can see that the initial steps taken were critical. Those that went for an early and hard lockdown, have come out okay. Those that dithered and fucked about, have been a disaster. Lockdowns are almost pointless in the UK/US because they let the virus run rampant.
The bigger the population, the better the chance you get some total fuckwit like the one from Papatoetoe.
With regards to the borders, we only need to ask Trump to find out how porous their borders are. LOL!