Most of these dams are explicitly uneconomical to run with modern safety standards and 50 years of being under-maintained. There's a lot of dams that were built, the original owners eventually figured out they weren't as profitable as planned, and just wanted to abandon it. An abandoned dam is a future "natural" disaster waiting to happen. And most of these dams were built with pretty mediocre standards, and we don't even build these kinds of dams anymore because they have all sorts of ways of failing unexpectedly.
They have to come down because they were privatized gains, socialized losses as usual. Private companies built them, decided they didn't want them anymore, and basically handed communities unmaintained dams and said "deal with this or drown when it fails". Communities generally don't like being saddled with the waste and consequences of a failed or finished private venture.
We in the US had a huge dam boom at one point, turns out most of them were over-optimistic.
They have to come down because they were privatized gains, socialized losses as usual. Private companies built them, decided they didn't want them anymore, and basically handed communities unmaintained dams and said "deal with this or drown when it fails". Communities generally don't like being saddled with the waste and consequences of a failed or finished private venture.
We in the US had a huge dam boom at one point, turns out most of them were over-optimistic.