There are no 'baddies', there's just market competition. The producers have increased their yields - and hence their production quantity - to try to maximise their income, but have created a surplus.
They complain about what they're being paid, but the buyer doesn't set the price in isolation - they're all trying to undercut each other, and the consumer is benefitting.
If some of them can't break even they either change production or go out of business - that's market economics. More farm buildings that can be converted into housing, and fields that can be returned to heathland.
Fewer farms results in less milk produced, balances the supply side of the equation with demand and we all carry on.
If the farmers, as a collective, are desperate for something to change then they could collectively decide to push their cattle a little less intensively, all scale back their production and balance the market, but they've all scaled their purchases, commitments and production rates on the assumption they can sell everything - basically, poor forecasting.
If banks forecast poorly we - rightly - castigate them because we suffer the consequences. We're lucky in this instance that the farmers have overproduced rather than underproduced which would have put our prices up. If that had happened we'd all be complaining, but this is still ineptitude on their part.
O.