I will also go with Otis on this one. Most people who are vegans do not know how to properly substitute for the lack of meat they eat and they end up suffering as a cause. Which reminds me of most people on diets, no one really expects them to work because it's off of the same basis. You just can't remove something from your eating pallet and expect to naturally compensate for it for a positive result. Veganism is just another form of a diet and like all diets, it is usually done wrong. (anyone who rages at me for it must be someone doing it wrong.)
Also, I'm not exactly sure which is more inhumane. Butchering animals, processing them and making sure they're in no means to feel pain when consumed, or with plants, ripping parts from the whole without remorse, chilling them so the parts do not rot or become bad, then when eaten, is usually done at room temperature with blunt utensils or teeth and the thing is literally eaten alive.
Just imagine if we did that to meat. Severing an animal's head, keeping it alive and cooled so that it doesn't rot, then taking a big ol bite out of it while it's staring at you. You'd be grossed out for sure, but how can you guarantee that a plant isn't doing the same? Sure, it has no face to look at you or a mouth or lungs to scream as you render it's flesh piece by piece, but those things can sure feel pain and a silent death is still barbaric by animal and human means. Plants are still living beings just like us.
