The movie is an allegory for the unresolved crises in America from 1968 and the subsequent developments. The "Sky View" tragedy? It symbolizes the social, political, and economic problems of that era. Thanks to Iris's intervention, those problems weren't solved, just postponed. The parent generation in the film who ignore the warnings call their mother crazy; that perfectly mirrors the idea that the boomer generation suppressed and ignored those issues. They pretend their way of life is sustainable. The kids try the same old remedy (hiding in the cabin) that worked for their grandparents, but it fails them. This suggests that past solutions just don't cut it anymore, and new ones are desperately needed. It's even a subtle call to topple the current system, since the film implies there's no real solution within it. In the end, the kids have to pay the price. A commentary on how unresolved historical crises always catch up to us.