Politics is
way more important than most of what we discuss here. Think about topics like gay marriage: being able to marry who you want is a much bigger deal for most people than whether Node.js is better than Erlang (Erlang is way better!).
That's another reason why it should be banned, because it will crowd out other topics by dint of being more important to more people - which is also a feedback loop, as more people get drawn in for the politics.