I agree. The content on HN became quite politicized after the NSA scandal. This may, honestly, have something to do with the fact that pg himself, and the moderating team, were concerned enough to allow these topics to be prominent and widely discussed. Perhaps it was okay for a time, but if the board is to be politically mobilized on occasion (eg SOPA) it should be
very infrequent and it needs to
end at some point.
We have simply discussed the surveillance scandal enough. There's just nothing more we can say or do that will matter right now. When Americans here go vote in November, maybe they will remember. Maybe they won't. Either way, the horse is long since deceased and partially liquefied.
My suggestion may sound silly at first, but I think it serves a real need. We, as in Paul Graham, the moderators, and the community consensus, have twice now (first SOPA, then spying) decided that such-and-such political issue is important enough to the technical community that it deserves to be discussed and mentioned. When that happens, the the moderators can slightly change the board style to indicate that discussions relevant to the present crisis are acceptable -- maybe a black border and lettering on the Y symbol at the top-left. When the controversy ends, the board style changes back, and just this second signal is the important one: it means that we are done, it is over, if you want to keep discussing politics do it somewhere else.
I, like you, appreciate the possibility of a board devoted entirely to technical content, but the reality is that sometimes it may just not be feasible, here, Slashdot, or anywhere else. It is far better to have a system in place to keep such discussions under control than to pretend they won't happen at all. Because they have, more than once, and they will again. Occasional, specific discussions of events involving the tech community may be important simply because, in small amounts, they facilitate cohesion among the members by drawing our attention to things that may affect us as a whole. But the important part is occasional and specific.
Any community devoted to research and development, like HN, faces the challenge of living in the present while building the future. Our priority should always be the latter, even though we are part of the present world, and occasionally we find the present needs us. But the future needs us more.