I understand what you intended to be the joke. I just don't think you get it.

This is a straightforward implication of having a consequentialist morality. Making moral decisions for deontological reasons and not because of the consequences according to the same value function is, by that standard, immoral. It's not a big deal.

Mind you, I have made jokes along the same lines myself at times. With the implication "it's funny 'cos it's true!". I begin to see why it had a mixed reception.