Brad the organic food thing is part marketing strategy part healthier eating.
Organic meat is supposed to be healthier because the animals are not supplimented with growth hormones which are transferred to the person eating it and routine pesticide/fungicide etc. treatments used in normal farming methods that contaminate and affect the environment. I do see merit in the concept especially when farming is so money driven that they will do anything to increase production regardless of what sort of effects it has on the meat they're delivering.
As far as the vegan thing goes, each to their own. I don't believe you're 'saving the planet' by not eating meat and if you're not sensible about it you may not be doing your body any justice either. I have seen many strict vegatarians that look a bit like scrawny pickled olives and thinking to myself 'what on earth are you doing to yourself?' Coming from a part owner of a beef farm I could happily live on a meatless diet and I don't see myself doing very well on a purely carnivorous diet so IMO all in moderation, leaning more towards the vegetarian side of things. At the end of the day it all comes out looking the same