Are all PET Tweets attacks/insults/defensive/offensive? Why not Twitter only kind/complimentary things? What could it hurt?

Cos that's not the kind of person he is.. he doesn't have that generous trait in his character.

He is doing that for a reason. It get the people so wrapped up and addicted to his comments, that they do not look at what he is doing off line. He is a business man, and knows how to keep the investors (in this case voters) looking at one thing, while he does another.