I think vegans should not expect that world will ever accept all those very strict rules. There's no need being perfectionist. I think it would be huge success if people get used to eat meat once a week, not everyday in every meal. When you say to someone that he/she should quit eating meat for all his/her life, it sounds frightening. That is why most of the people even don't want to hear anything about vegetarism (and even more about veganism).
But just count what an effect it would have: for example, if person eats 100g meat every day, that means that 12 chickens(or smth like that weighting 36,5kg) was killed for him to supply a demand. (And I'm sure some people eat much more meat). But if person eats meat only once a week - it is just two chickens killed per year - 10 chickens saved!!! But the main meaning of this is, that less meat consumption popular beyond people would make a difference, not few individuals under very strict regulations.
Not everyone can determine to stop using animal products straight away, but it is much easier to take little steps towards it.
Actually, that is how I become a vegetarian. Meat seemed

ing to me after I saw few videos in Youtube about how chickens are grown these days. I begun eat meat very rarely and every time I tasted it again, I thought: 'It's not even so tasty, why people are so obsess about eating meat?'. After, eggs seemed

ing to me as well and so on...
I guess I'm lucky I never feel attraction to meat, but I know that if I'll ever want to eat a piece of meat, I will and I don't care. I'm not that sensitive and idealistic - one killed animal will not change anything. It is more about everyday decisions.