Nowadays most people
can survive without eating meat so it isn't a nessecity for them but they don't want to regardless of the pain, suffering and all the other factors which point to it being a bad idea. I suppose quite a few people don't care or do care but just don't have the willpower to to stop.
I can say I have been brought up with the idea of eating meat and had never seen any probblems with it till recently. Also my parents think if I became vegetarian it would have a bad effect on my growth because of lack of nutrients present in meat. Whether this is true or not I don't know.
This is my point of view.