I did point it out and I didn't down-vote him (because I was hoping he would expound on it). But you know that voting means different things to different people (and HN has gone on vast navel-gazing tangents trying to define it).
If people see a controversial position half-heartedly argued, the bad marks should not come as a shock nor am I sure they are unreasonable. In the end though, the points are utterly irrelevant as long as it doesn't dissuade others from taking controversial positions and, crucially, defending them.