Ask HN: Why are you blocking users from the Tor network?

When accessing the Hacker News through the Tor network, in the vast majority of cases (exit nodes) you will get "HTTP/1.1 403 Begone!".

I'm not suggesting anything, but the timing of this restriction is not very good: it started just after the NSA hit the fan.

HN, if the reason behind this restriction is that you sipmly don't want anonymous postings then let us (Tor users) just browse the Hacker News at least.

Thank you.