From memory one hypothesis was that tin had become an essential trade good that was required for making bronze, and therefore using bronze for many of the times’ high-level technological innovations, especially construction tools, weapons, and for ships.
However, tin is rare, and at the time, there were only a few disparate sources of tin. It’s suggested the middle east sourced most of its tin from China via the silk road, and Ancient Greeks were getting theirs from deep inland European sources (possibly near Hungary, Brittany in France, or Cornwall in England).
This was fine during settled and undisturbed times, as the very long, convoluted trade routes prospered and grew.
But they were very susceptible to disruption during unsettled times, and it wouldn’t have taken taken much to be disrupted by large movements of nomadic warring raiders or groups of peoples, or particularly terrible famines or natural disasters located across critical trade routes.
And as states and cities likely isolated themselves behind city walls to protect themselves from the strife of the time, this only would have decreased trade even more, and suddenly they would no longer have the ability to make the essential tools and weapons their societies had become reliant on, in the numbers required, right when those nations needed them most.
This would have been especially ruinous if those nomadic raiding tribes, or groups of unknown origin like the Sea Peoples, had access to iron technology, which required only one more easily sourced metal, iron. Pure copper weapons, due to lack of tin to make bronze, would have been fairly ineffective against iron or bronze equivalents.
It’s a hypothesis, and not “proven”, but I’d say it’s a fairly plausible explanation for what likely happened.
Not excusing it, but I’d say it’s very easy to feel disconnected from others when you’re in a privileged position of power.
Everyone else becomes “them”, and you lose track of what “normal” or “average” experiences are like, because you tend to live within a very different space to others, and tend only associate with people with similar privilege levels.
I remember visiting my country’s Parliament building, and within about 15 minutes having this weird sense of disconnection due to the incredibly different beautiful and privileged environment. Everywhere were massive pieces of art, beautiful marble inlays, everything was clean and well ordered, great big wide open spaces, beautifully carved wooden chairs in dining areas etc.
I remember thinking no wonder politicians tend to be labelled disconnected and removed from the concerns of the average citizen. If I was working in that building 8-12 hours a day, 4-6 days a week, 40+ weeks a year, I’d find it hard to remain grounded and to also remind myself that what I was experiencing was something less than 5% of the population might experience, rather than being the “norm” or standard for the majority of the population.