Maybe not now. But you don't know what your life will look like in 10 years, or even 20. People end up in politics more than they ever imagined, out of necessity. It's the OpSec equivalent of holding something behind your back and saying "no, there's nothing there." Makes you look even more guilty. You look a lot less guilty if you hold non-suspicious things behind your back often. Then people are more likely to think you're odd, rather than guilty. Kind of a bad example, but you get the point in the abstract.

Suddenly starting to join the Tor network often around the time some major information is leaked would be a strong correlator pointing to your guilt. I'm just using one example, but there are many scenarios where this matters.