If you fail to tip them, you've failed them too. It's not complex.
You argument absolves the restaurateurs if consistently applied because the legislators failed them upstream (that's not to speak of absolving the legislators because of the voters) - I'm saying the legislators failed them, then the restaurateurs failed them, then the people that refused to tip them failed them. There's not a single point of failure, but that doesn't mean it's OK for you to decide to be the ultimate point of failure.
We're overpopulated given our current resource distribution/consumption, but solving that through eugenics is obviously moronic.