I quoted and if/then type statement you made. That statement’s conclusion does not follow from that statement’s premise. I clearly did not agree with that statement and gave reasons for why it is obviously false.

Are you referring to this one?

> if the author really thought donating that extra $X to the government (when other people do) was such a good idea, they would be donating it right now

Which part are you disputing? Your comments about human psychology merely support the fact that the author doesn't really think it's a good idea, and that there are psychological factors other than rationality and honesty at play.