Farmers care about making money.

And farmers that don't care about making money aren't farmers any more.

Agriculture is a highly competitive business - even large scale agriculture still has very stiff price competition. There isn't a lot of fat to burn on charitable gestures and what is there isn't on the scale of maintaining such a large unproductive orchard.

It sucks - don't misread my statement. It is deeply unfortunate and we should consider mitigations for the future - but the party to throw blame at here isn't the farmers and neither should they be expected to bear the cost.