Mars chocolate actually doesn't taste very good anyway. Green & Blacks is better, to name just one. I'm a vegan (well, near vegan. I sometimes eat butter) and I wouldn't eat Mars products anyway because they have milk and stuff in them. But even before I became vegan I didn't like Mars stuff. It's just sweet, it doesn't even really taste of chocolate.
Anyway, the main lesson, and an encouraging one I think, is that when a large consumer group speaks up, industry listens. We should remember this and hit them harder about packaging, waxing, pesticides and factory farmed meat. If we stop buying it, they'll stop making it!