Ok, let me re-phrase.....would someone who had decided to abstain from voting, for whatever reason, really return a spoiled paper, or would s/he merely not bother to return it?
I don't think I would bother to open the envelope, if I were in that position.
Anyway, my point was that, just as one should not condemn all those who undertake overtime/VAPs/AAVAs as being greedy, one should not condemn those who did not return a vote as 'couldn't be arsed' or 'didn't think it was sufficiently important enough' or 'lazy'.