You ever notice how the in Jurassic Park movies T-rex is always being a big, angry prick? I've figured out why. It's because he has really small, really useless arms. And no, I don't mean he's angry because he feels like evolution is playing a sick joke on his species. But rather because his lack of arms means he has to use his head to do everything.
Rex needs to break through a fence? He has to ram the fence with his head.
Rex needs to flip a jeep full of annoying people? Smack the jeep with his head.
Dead tree blocking his path, and it's too high to step over. Run through the tree head first. Car door didn't quite close? Gotta smack the door with his head.
Rex wants to spread peanut butter on his toast? I don't even know how one does that using only their head, it's probably a very painful method.
The reason Rex is so pissed off all the time is because all that repeated head smacking is doing severe damage to his brain. He can't control his emotions like he used to. He finds himself crying uncontrollably over the stupidest things. He never used to cry about anything, not even during really sad movies. Things that used to annoy him only a little, now make him furious. And worse yet is he tries to hide his emotions because dino-culture looks down upon males openly expressing their feelings. Also, take note of the dark circles under Rex's eyes. Obviously, he isn't sleeping anymore. The hormones involved in regulating sleep are often found in the brain, and a damaged brain means those hormones are broken. The lack of sleep worsening his symptoms. Rex is likely contemplating suicide.
Then the humans, instead of reaching out to Rex in his time of need and offering their support to him, torment him further, sealing him off by erecting an electric fence around him. Leaving Rex on display like he's the single freak in a cheap, eastern-European sideshow, with only his broken thoughts to keep him company. Can you really blame him for lashing out? You can't create a monster, cage it, and then condemn it when it breaks free and eats your whole family.
Moral of the story, if John Hammond had given all the T-rex's robot arms, all them Dinosaur psyches could have been saved along with countless human lives.
see the difference?
SideNote: As for the "Velociraptors" and their animosity, they're anger stems from class and racial inequality issues, not to mention a confusion of identity. Those problems are much harder to solve.
SiderNote: And for fuck sakes, why are the paleontologists in Jurassic Park such dinosaur newbs? Velociptors are the size of medium-sized dogs; they'd be no taller than your thigh. Those "Velociraptors" you see in the movie if properly named would be Utahraptors. Stupid ass douches having the gall to call themselves paleontologists after making such a blatant dinosaur mistake. They should be forced to eat their cowboy hats and plaid shirts.
Did nobody think to open a book about dinosaurs during pre-production of the movie to look up just how big dinosaurs actually are?
"Fuck research. Whatever I get completely wrong I'll just call artistic license" - Steven Spielberg