>>6215
Of course you can, but it's much easier to maintain a coherent natural impression if you believe it, and it's easier to believe it if you act it out.
Perhaps more importantly, you can be seen visiting the voting booth and having a sticker you got for it and all that, and if you're going through that trouble anyway then actually casting a vote doesn't carry an additional cost. You can hide what you voted, and thanks to blank votes it's technically possible to hide whether you voted, but that doesn't stop you from sending a credible signal that you voted.