One of the biggest things you can do to dilute your message as a group, especially a small group, is to choose too many targets. As you said elsewhere, Greenpeace is already promoting veganism, as is PETA and a number of other groups. These guys don’t need to jump on that bandwagon to get the message out. Let them focus on what they’re doing, which also needs to be done. Otherwise, all you’re doing is redirecting criticism from the bad actors to the people trying to make them stop.