One thing that everyone should remember about vapour barriers is that there are more things that are vapours than just water.
Your basement being dry as a bone isn't going to help you if it is flooded with hydrogen sulfide, Radon, or some other hazardous gas. H2N is especially nasty if allowed to pool because of how little it takes to kill and how quickly it can happen, and can kill half a dozen people in a basement. One example I've seen quoted in training material a few times was a couple who built a new house, finished it, then went on vacation for a month. During construction they associated the faint smell to just churning up the damp clay. But then then the house was finished and the basement sealed up to pool the gas slowly being squeezed up out of the earth. Couple came home, one of them went down into the basement and was overcome by the gas. The other probably heard a thud, went to look, and then rushed down to help...
Family friend drops by, finds the couple laying motionless at the bottom of the stairs, and rushes down to help. Someone else finds the three of them, calls 911, and promptly rushes down to help. First responder on the scene went down to 'help' before the fire department finally came in to carry out the bodies.
While it is highly unlikely to be an issue in most cases, the other uses of a properly installed vapour barrier are important to consider, and the issue should addressed in any regions where such risks are of higher probabilities.