the only kind of person that has influence over masses of people besides politicians and bankers (and maybe terrorists and police) is a talented artist.
media and publication is the most powerful form of communication to the masses, and an artist has free reign of what material he publishes. Pac used his pen to write raps, as long as he knew and complied to the laws of publishing, the law couldn't touch him for what he said in his raps.
i think 2pac knew too much and he knew it. having knowledge is power and he came from that perspective to attack the whole system.
tupac is dead because of the message he was trying to send. all you other suckers thinking that pac is still alive are in denial, and can't see the perfect picture that he was painting.