Well, it was specifically built to keep out the White Walkers so that would presumably be the argument.

The two that have got south were both wights rather than White Walkers. Benjen Stark said he couldn't go beyond the wall either, but then he was 'revived' by the Children of the Forest (like the White Walkers were originally) rather than being a wight. Perhaps that's what the argument will be.

Again, it's angels on pinheads. Just enjoy the programme for what it is.