Seriously, are asking why we subsidise agriculture?
Well, why stop there, why don't we just subsidise everything that makes a loss?
Because the global commodity argument fails.
It presumes that there is always a magic shop out there that we can always go to to get stuff when ever we want it (And that we will always have the money to buy at whatever price the global goods are selling for)
This is not going to be the case. What is more. Agriculture and Heavy industries like Mining, Steel, shipbuilding (And indeed Nuclear construction) are not things that can be shut down because the global price is low and suddenly started up again in ten years time when the "Current Economic Situation" has changed.
These industries take skill and knowledge. Skills and knowledge that can not be easily got by reading a book or going to collage. They need to be passed on from one person to the next. If the chain is broken the knowledge will be lost and very quickly too.
Take coal for instance, we currently import 3/4 of the coal coinsumed in the UK. This is despite sitting on reserves of billions of tons. But that deep coal might as well be on the Moon. It would be almost impossible to start up significant deep mining in the UK because there is nobody left who knows how to do it.
We are having to Kow-Tow to the Chinese (See what I did there) and the French because we shut down our Nuclear industry post Sizewell and nobody knows how to do it any more.
The QM2 was built in France because nobody here can do it any more.
(The most astonishing thing to me about the new Carriers (Elizabeth class) is that we are able to build them at all)
An industrialised country that cannot make steel is like a farmer who cannot grow food!
Can you see Germany, or even France allowing their steel industry to be lost for ever because of "Current Economic Circumstances".
Only in Britain as they say!