The trolley problem analogy breaks down when you consider that Covid is an infectious disease. Getting vaccinated doesn't just protect you; it protects everyone else you might have spread the disease to.
Both technically true statements (though I think you mean Iceland), but presented in a completely misleading way. Yes, breakthrough infections exist and nothing is 100%; you should still get the vaccine, obviously. Yes, when the population is highly vaccinated, a lot of infections will be in the vaccinated; that's just how denominators work.