While I appreciate what Marcus is trying to say with regards to free speech, he completely misses the plot with 2 points:

1) Telling us to simply ignore white nationals and holocaust deniers is outright dangerous - it is imperative to defend the truth.  We cannot let the voices of hate and lies spread their word to anyone that may be impressionable, as that is how hate movements start

2) the speakers corner in London's Hyde Park is not anywhere near the same as a public library.  Sorry Marcus, this comparison falls way short.  A library is a place of learning, education, and a meeting place for people to research history.  Holocaust denial is simply denying scientifically proven history, and people who believe in it have no place in our institutions of higher learning that encourage gaining knowledge of our world's history.