Is Vegetarianism Logical?

It was June 1st 2008. It was raining heavily and Dad was enjoying the drive back home. My little bro was comfortably sleeping in the front seat and I was there at the back unable to deal with my headache. I was looking outside. Rain. I don't get to see it in Delhi a lot. All I was wishing at that moment was to get out of the car and get wet. But of course, I could not do that.
Afte a while, the rain stopped. Yeah.. so what? At that moment I saw one modified Ford Fiesta. Cool! I kept staring at it. Then my EYE caught three bulls, tied together. Why were they being left there, where is their owner. That's when I saw another bull run past our car and a man running after it with a stick. Was the bull scared of something? Why was it running away? It wasn't hard to find out the reason. Beef. Cow-Bull meat, widely eaten in Kerala. I looked back at the other bulls. Did they have the same fate?

Actually I had a wish to be a vegetarian long before this incident. But at that time is was for no reason. This time, i had a pity for those bulls. The thought of finally becoming a strict vegetarian came into my mind. I said it out to my dad. He smiled. Then he asked me why I wanted to do so. I said I don't like animals being killed just for humans. He smiled again.
"I'm proud you are taking such a decision. Do what you think you should. But I want you to argue about why should one be a veg. I'll talk against it."
I did not stand a chance against him. "There was once a scientist, who was a strict vegetarian. He hated doing the slightest harm to an animal. This was before the microscope was invented. It later was made and this particular scientist bought one for a high price. He was excited of having such a new instument. He wanted to make discoveries. And he did. Once, while studying a steel peice under the microscope, a leaf from the tree outside flew into the house through the window and somehow, landed on his pallette, on top of the stell peice. He was surprised to see the number of moving 'creatures' on the leaf. What were they? Were they cells? Can it be? Living cells? He noticed after some time that the cells started to die. He ran into his kitchen and brought a carrot piece and studied it under the microscope.More living cells. Does this really mean that plants are also living. That explains why plants grow from small plant to big trees! But then he realized something. Although he was a strict vegetarian, he was killing. HE was killing the plants to eat it.
He comes out with his discovery but adds, 'Any person who is an actual strict vegetarian, will have to starve to death.' "
What dad was saying was right. But....
"You say that it feels bad when killing an animal. All right, you kill a hen, you have cut off it's throat. But, how can you know if the top of a carrot is it's head. You cut it off. It's the same as cutting a hens throat. Man is incapable of seeing or feeling the life inside a plant. Science may prove that a plant does not have a hand or a face. But that is according to what WE see. It may not be a reality. Trees may be having eyes with which they are looking at us all the time? How can we know?"
"It is man's incapability that he can't feel a plant."
"Man was actually made a vegetarian. Man's intestined are like that of a cows. But we still eat meat, but do you eat it cooked or raw? There lies the point. Man cooks food not only to make it tasty, but also to make it digestable. Man's actual canine, is not his teeth, but his brain."
I gave up. But dad continued, "Don't change your mind just because i told you all this. Stay a vegetarian. But try to defend your point well with logical points."
And yes, It's been only a week, since I turned a vegetarian and I'm doing good. I have not touched non-veg. Once I was offered even prawns. PRAWNS! MY FAV! I did not eat it. I had to stck to vegetarianism.

I still feel, being a vegetarian or a non-vegetarian does not make a difference. But in the world, Vegetarianism has always been encouraged. So I ask you people : IS VEGETARIANISM LOGICAL? Please answer my poll and leave comments about it.