Did the scientists ever bother to ask the most logical question about feeding the zombies so they don't eat us?
Where do you get the flesh from to feed them? He even says they only feed on warm flesh, so the flesh must be from the fleshly dead/recently living.
Is he advocating that some people must die for the greater good?
Probably. It's all part and parcel of one of Romero's theme for the movie. That science is just as useless in the end at solving problems as the military, the government, police, and religion.
That does beg an interesting question. What happened to all the prisoners at the start of the zombie outbreak? Were they all released to fend for themselves or kept behind bars to starve? Did the people who run the prisons lock themselves up with the prisoners to survive as long as the food held out, keeping the prisoners in their cells and not giving them anything?
The zombies wouldn't be able to distinguish between the food they're supposed to eat, and the people feeding them. You could feed them, but that would only serve as a distraction at best, then they'd eventually come after whoever was feeding them. Day Of The Dead told us that the zombies don't eat for nourishment, so it's not like they'd have their meal and decide to not eat anymore until later. Leaving all the humans alone in the meantime. They're just compelled to attack/eat. Dr. Logan did some experimenting with feeding zombies as a reward and conditioning them, but it wasn't a very practical solution, given the amount of zombies. You'd basically have to lock them all up and have somebody condition them, and Bub is really the only one we see that responds to this method. He seems a bit smarter than the rest of the zombies, it might not work for all. And given the sheer number of zombies, coming up with that much food for them would be pretty much impossible.
See you guys at the 10 year prison reunion - Ben Richards
There's also the sheer numbers problem. Feeding the opposition doesn't make much sense when they outnumber you by so much.
Of course, the lack of food problem begs more questions. As was said, zombies don't eat for nourishment as revealed in Day Of The Dead. So, where are they getting energy from to move about and eat people? Energy has to come from somewhere.
In Night, it was hypothesized that a space probe returning from Venus brought with it a mysterious level of radiation. It was destroyed before it could reach the Earth's surface and this level of radiation is believed to be the cause of the dead returning to life.
Radiation was always the go to reason. :) People just couldn't accept that all radiation does is kill you. They wanted to believe it could make tiny creatures into giants or revive the dead.
Now, with Dawn, that film is not a direct sequel to Night. It uses some of the same in movie rules but that's it. It was filmed 10 years after Night and the advance of technology cannot be explained away if it's a sequel. For instance, there were no video arcades in the time of Night. :>