Worst case scenario: you die, or you die after lots of torture. Why not look at the most probable case, which is nothing happens? There's a quote from Richard Stallman that applies here: "They seem to have learned the habit of cowering before authority even when not actually threatened. How very nice for authority. I decided not to learn this particular lesson."

Personally, I fear writing certain things with a username that's easily associated to my real name by the public at large, not the government with their clever tools. That's because I know the real and not-so-improbable consequences of doing so[0]: losing my job and getting blacklisted from the entire industry I've spent most my life trying to improve in and contribute to. It can be economic death. The threat of the mob is much realer to me than the threat of the government.

[0] https://handleshaus.wordpress.com/2013/12/26/bullied-and-bad...