You can see their point, the fear of all those panels sliding down a hill and burying the local school is too high a price to pay for clean energy.
There have been several fires at solar farms (actually, at the battery storage bits I believe) but I'm not aware of them causing any injury or damage outside of the solar farm itself. I note it is West Oxfordshire, that's the planning authority that covers itself in glory on Clarkson's Farm I think.