You have to understand Pac's perspective after when he got shot in robbery at Quad Studio. He felt betrayed by Biggie for not warning him that he was gonna to get robbed and Pac felt Biggie knew it but didn't tell him. Pac was having hard time to trust anybody. In his point of his view, I can see why he mad at Snoop for going on the radio and cool with Bad Boy but at the same time, I can see why Snoop said that cause after Snoop's murder trail, he was about to lose his career and was about to have first born son. Snoop realized all of that shyt isn't worth it.
Pac mad at Dr.Dre....that's one I don't understand it. I think Pac was just being a loyal to Suge after he took him out of jail,etc.
Dr.Dre was just being smart and he didn't like to see what's going on Death Row all the bs gang shyt going on and in the studio. Dre was just being tired of BS...He just wants to focus on the music. That's why he left with "NOTHING". Dr.Dre said, "I don't need any of that shyt and not even money, Suge can have all of his shyt. I just want to GET OUT".