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My thoughts on the conclusion (after reading some posts about it here and elsewhere):
Riley saved the citizens who were living in the slums. Earlier he told Cholo that if he hit the tower, he'd kill a lot of innocent people. If he hit the city, he'd kill friends. The slum citizens knew how to deal with the zombies but most of the rich ran into something that was presumably funded by them to protect but ultimately lead to their demise. Sorta like the barriers you build around ultimately condemn. Big Daddy and his army were focused on taking out the beckon of power that is FG. I was reading a review a couple days back that noted that FG seemed like a big middle finger pointing out in all directions, thought that was an interesting way to see it. Riley and company thought they were too late for those living in the slum surrounds. The residents of FG weren't his primary concern. After the reluctant fall of the electric fencing you see the slum surviors walking out (I like how you almost think it's more zombies for a second). Mulligan speaks with Riley and alludes to him making a good leader, Riley brushes off the remark with Mulligan saying "We'll see." So I'm presuming the surviors are going in the same direction as the Dead Reckoning with the fireworks perhaps signalling the right direction. Riley will lead the way to the promise land.
I still think the "Looking for their own place..." comment works because looking at the situation, Pittsburgh was a powderkeg waiting to explode sooner or later. Either by what occurred in the film or by the poor revolting against Fiddler's Green. It was rotten, so humanity really needs to start from the ground up again, if possible. As Logan stated in Day, the undead have the remaining living in a hopeless situation, do you really think you can "blow the piss" out of them? All of them? Sure, Riley and his team could have gone gung-ho on the zombies that were right there, but after their ammo was gone, eminent death would have been followed. There are millions or possibly billions of them. At this stage in the game, humanity cannot win, either die or just keep moving. Finding our place, somewhere. It was better just to get moving North, the city was a lost cause that folded like a deck of cards. It wasn't just a lost cause because the undead invaded, as I said before it was rotten to begin with from what humanity became within it's borders.
Humanity on both sides of the coin had something that could have worked but screwed it up, so once again the dead have their day. Just like the farmhouse, the mall, and the underground installation. Just like in Dawn and Day, the living must move on. Both literally and in letting go of what we had long ago.
Riley did show empathy with the undead at the conclusion. After all, they were (and still are to a lingering extent) us. The main cusp of the film is that Big Daddy is angered into action by the living encroaching onto the undead's territory. It's not just that, they're wantoningly massarcing his fellow dead while doing it. A point even echoed by Mike while riding with Cholo who says something along the lines of "I thought this was a mission, but now it's a massacre." as the Dead Reckoning blasts the hell outta dozens of zombies even though it's not needed. Perhaps if the living didn't step on the dead to this extent they wouldn't have struck back. There is evidence in this film (and the slum survivors are leaving the city at the conclusion) but more so in the entire series. The real turning point in siding with the dead more than the living is in Day of the Dead. The humans are in a fury and some are dancing of the frayed ends of sanity. The dead are just there, still desiring to feed but they're food supply is draining. Bub is becoming more and more aware.
In Land, The zombie "species" is drastically changing, not just to the extent they now use tools. Maybe they're even beginning to feel just enough to realize their days are numbered. Not at the hands of the humans, but merely by time. There's an imbalance between the numbers of the dead and living species. Perhaps the dead are realizing this too. They want to fed upon humans in order to continue their existence, but what does a zombie become after there are no humans left? If you think about that through the eyes of Romero's current "undead condition" it's quite chilling. Big Daddy may be aware he's doomed to shamble, never being able to feed his innate need. I think this could be why he didn't "eat" in the film. What happens if/when the rest of the zombie population becomes this aware?
This film showed the zombies asserting their place as the new top dog by using much the same force the living brought upon them, but still they could be carrying a much more heavy burden upon their rotting shoulders.
The more I dig my way into it, the more I like it. I'm seeing it again very soon.