Question about Predator policy

[Eyeball]

In the first film (Schwarzenegger 1987) the Predator apparently had a policy of not killing unarmed people, that's why Arnie kicked the gun out of that birds hands so the Pred wouldn't regard her as a threat, and it left her alone.
But in later Predator franchise films such as Aliens vs Predators (2004), the Preds apparently DID kill unarmed people.
Were the earlier Preds soft or what?

 

[Foxbat]

I’m sure if you asked one of the scriptwriters, they’d invent a credible excuse for the killing unarmed humans. After all, it is only a film.

Still, to keep to the spirit of the question.... from what I recall, they were hunters and there were indications that they followed a certain code. Perhaps in AvP, they killed to punish the humans who interfered with the workings of the pyramid which, unless my memory fails me, was set up as a kind of ritualistic hunting area (or perhaps even an initiation area for younger hunters).

A piece of personal trivia: I once met an American who said he edited the trailer for the AvP movie. It was in a hotel bar in Bridge Of Orchy (Scotland) around about 2007. We got talking and I told him how bad I thought the movie was. He wasn’t bothered and said ‘But you watched it, didn’t you?’

He explained to me that if he could make a trailer that attracted people to watch a bad movie then he’d done a good job. I thought he made a good point.