I think making "no politics ever" a rule can hamper discussions quite a lot. I can understand why it's not productive to talk about, say, the merits of Obama's health care bill, which evokes really partisan gut reactions and makes people more likely to start posting pithy political slogans that sound good and make for horrible discussion. But talking about a reduced crime rate without crediting/blaming any particular politician or party can be pretty interesting to talk about.
On the other hand, I don't think any of the anti-DRM or anti-anti-piracy posts are very productive. But everyone here seems to agree on them, so even though the discussions are often quite vapid, they tend to be less nasty than, say, discussions about the merits of single-payer healthcare.