I won't derail the thread any further than this post but you are all over the place with your arguments here.
Of course subsidising farming and setting quotas curtails your ability to source from outside, that's the whole point of it, to stop EU citizens from buying cheaper food from outside by taxing them and using the taxes raised to pay for farming that couldn't compete otherwise and when that doesn't work set quotas. If the other sources can't sell into lucrative markets like the EU then they don't produce it and can't develop the agricultural industries as there is no return. Then the EU dumps its surplus on their market and destroys their ability to produce enough food for themselves. There is a reason CAP is loathed by food producers around the world and they have a valid point.
Meanwhile we all pay more for our food which might not be very important to you but its a major cost to the poorest, they are burdened with it in order to protect the income of some of the wealthiest people in Europe. Agriculture is less than 2% of EU GDP and employment in agriculture has halved since the 90's yet the EU spends 40% of it budget subsidising agriculture through CAP. It is utter madness to continue with this policy but the proposed 5% reduction for the next round of spending is already opposed by France and Spain.
This is not about temporary support during the occasional downs this is ongoing massive support of failing businesses in a sector that falls further and further behind the rest of the world. Its wasteful, corrupt, immoral and deeply counter productive but the EU loves it and people who love the EU go to any lengths like citing like the potato famine from 1840's to try and justify continuing with it.