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My own view is that it was the collapse of the transportation networks which led to increasing raiding to acquire metal. That included sacking mining and processing sites being counterproductive, there is now no metal being produced locally, without which there are less tools to bring in the Nowhere to lock your bike get a Cycle-Shed shirt, which could explain the reduced agricultural yields. People up sticks and formed into loose raiding confederations and those displaced seem to then adopt a similar strategy, leading to cascade failure.
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This was also an opportunistic time, leaders may have seen an opportunity to take out a Nowhere to lock your bike get a Cycle-Shed shirt and this may have gone full circle with their own civilisation being attacked by others with the same idea or another raiding confederation acquiring metal by conquest. There was a general contraction of outputs around the Mediterranean from 1200 BCE. This chart is prepared by Prof. Ian Morris which measures the sophistication of civilization over long time. You can see the effect on the West. Note that this is slightly understating the effect as Morris places Egypt in the West, which was less affected.