As much as vaccinated people can get infected and possibly infect others, they're 90% less likely to end up in hospital. And I think that this is the driver of most mandatory or semi-mandatory vaccination policies throughout the world. With a high vaccine coverage, it becomes highly unlikely that so many people will get very sick at the same time that the health care system won't manage to take care of all of them. Remember that this was the rationale behind lockdowns for most of the world - few countries aimed for eradication (China, Australia, New Zealand and a couple of others), most only aimed for not overloading their hospitals. And for many countries with a high vaccination coverage the daily number of cases is no longer significant. They're only concerned with hospital admissions - and any decisions regarding restrictions are based purely on that.