"Subsidizes industries just because they would go under if they don't is exactly what is suppose to happen in a free market. If your farm isn't profitable, your just wasting land and other resources by farming."
Except that the food supply is considered a matter of national security. Preventing famine in modern Europe and guaranteeing that foreign countries can't threaten our food security, is considered one of the biggest policies of the EU, and has been since the 50s or 60s, when many had lived through famine conditions.
This is slow to change. partly because the farmers who's livelhoods depend on these subsidies still hold significant political power (in terms of farmers unions, protests, strikes - and they can protest by bringing their tractors onto major transport routes and slowly driving to their capital city... perfectly legal form of protest, but if the entire farming union decides to do it a country is brought to a standstill)
This at least is the justification - one way the current subsidy is being reformed is to change it from paying for production to paying (a little bit less) for land managment. So if you produce and sell your product for a profit, then that's great for you, but if you manage the land so it is available to be used to grow food you get your subsidy (and hence you can own farm land in europe and make a living from doing nothing with it... well not nothing, but not producing - and hence using up resources - which may then go to waste...)
" if they really wanted to cut the UKs contributions they could, and if they did I for one would give them all the credit they deserve."
Yes, but they don't want to - they get too much from being in the EU and the population has not given them a mandate to leave - cutting the contribution requires negotiating a deal with all the other European nations, and while they could just veto any deal it is clear that other European nations would go ahead without the UK if needed - they would sign a separate deal to fund EU organisation and cut the UK out of decision-making for that spending... As happened last time Cameron refused to make a deal.
Or he could unilaterally leave the EU, which is the simpler cleaner solution.
Practically he can't force other countries to a reduction in the UK's contribution, because they can veto any deal which they feel is unfair.