I think we should look at the history of Europe. Both France and Germany have been trying to dominate Europe for a long time by military means (Napoleon/Hitler to name but two.)
Having those ideas of supremacy scotched, they now seek to achieve domination by political means (The common market/ EU ) They see the UK as a thorn in their side and pay little or no heed to our well being as a nation. The are happy to take 230 million pounds per day from us. Do we get that back in any form?
There may be some benefits of membership but they are far outweighed by the cost to us.
The sooner we get out the better. It may be difficult but worth the effort.