Obviously, a lot of people aren't going to take the time to read through the full Numbers post. I'm regularly asked for simple bullet points, so here goes:
1. Do no harm. The biggest dietary change people make is replacing eating mammals with eating birds. Don't do any activism that could possibly support this trend, which causes so much more suffering.
2. Avoid recidivism. The vast vast majority of people who go veg go back to eating animals, meaning the vast vast majority of most veg activism is wasted. Avoid activism that encourages people to take unsustainable steps.
Thanks to everyone who has supported advocacy based on these principles!