Sergeant: Chief Heinemann says...
Lieutenant Mike Harrigan: Well, Heinemann can kiss my sweet ass!
Jerry Lambert: And you told me, lieutenant, "the only way you survive down here is because you're a team." "The door swings both ways," remember?
Predator: Shit happens.
King Willie: You can't see the eyes of the demon, until him come callin'.
Lieutenant Mike Harrigan: Ramone Vega, the crack king. Biggest operator in east LA. A hundred K a week. Why isn't he skinned, and who are these assholes?
Jamaican: King Willie says not only do I have to kill you, but I have to take your soul...with voodoo magic. Fucking voodoo magic, man!
Jerry Lambert: Lieutenant, I've paid my dues. I had to bust my ass to get my transfer.
Captain B. Pilgrim: Heinemann's already been up my ass so far I won't be able to sit down for a week. We're not winning this war. As much as it's going to piss you off, you're going to have to play the game in this one.
King Willie: They say you want to talk to me. They say you offering me favors. Tell me why, Babylon, Mr. Policeman.
Predator: Want some candy?
Leona Cantrell: So, what happened to El Scorpio?
Lieutenant Mike Harrigan: Oh, he's out front having lunch.
King Willie: This is dread man. Truly dread.
Lieutenant Mike Harrigan: OK pussyface, it's your move.
Tony Pope: This is Tony Pope, live from L.A., the city of fear, where the psycho vigilante killer continues his daily diet for murder. Bodies strung out. Bodies with the skins ripped off. The hearts torn from the cadavers. And just recently, King Willie, the drug lord, the vicious drug lord, found in an alley just around the corner with his head cut off, and his spinal column torn from the body. A fitting demise to the Prince of Powder.
Leona Cantrell: First Danny, then King Willie, and you were right there. He's playing with you Mike. You gotta be careful.
Lieutenant Mike Harrigan: Look, I don't care how big this is or who's involved. This guy killed Danny and he's going to fall.
Irene Edwards: He was boned like a fish.
Lieutenant Mike Harrigan: Shit! Why can't this guy stay on the ground?
Jerry Lambert: Okay everybody, just take a deep breath. Loosen your sphincters. We don't need any rush hour Rambos here.
Jerry Lambert: Yeah. They're setting up these weird radar sensors all over downtown. I mean, I used my whole repertoire just to keep up with 'em. I had scanners on them, but they scrambled my shit up. They had equipment I can't even begin to touch, and then this morning... I lost 'em.
Answer: The predators are honour bound hunters, and as such they will only attack a target if it is capable of defending itself (i.e, if it is armed, which is why it doesn't attack the boy in the cemetary). Although the police outside were armed as well, the Predator presumably attacked the drug dealers because they were a harder target (as the police were outside he could have just sniped them from the roof tops, but he had to get relatively close inside the building) and as such, killing them gave a higher honour. The obsession with Danny Glover's character is probably because he is quite a brave and heroic person, similar to a Predator (the way he saves the other cop by risking himself etc.), so the predator may have been studying him for a while. There's also more honour in killing someone like that (as he'd be a hard target) than there is in just killing a random armed guy.
Gary O'Reilly