The purpose is to refute the counterclaim. Hope this helps. :P*
Human beings need companionship in order to flourish.
For the most part, vegetarians still eat dairy products, egg products, and gelatin (gelatin is created through the processing of various animal parts)
He shows many personality traits throughout the play. Good and bad. In the beginning he prevents Tybalt from hurting Romeo though he is a Montague. This shows respect and empathy to his character. Later on, however, he tells Juliet that he will disown her if she is not to marry Paris. This shows that he believes that only he is correct and that his rules should be followed.