To be honest, I'll probably go with banana arguments.
Before the Cold War ended I was regularly scared about the four-minute warning, and my parents' generation were tangled up in WWII, foreigners were frightening, different was bad.
And a good point from the bloke about to fix my guttering, that we have no bloody clue what will happen if we leave, whereas the Devil EU know is much more predictable for good or ill, and every business from his to City types hate unnecessary uncertainty…
The big problem with the straight in/out question is that I suspect Cameron never thought he'd actually have to follow through on it, given a likely Tory minority at the last election.
As it happens, since you haven t asked but might be wondering, my a la carte EU feast might look like this:
Free movement of people and money, with some effort to minimise benefit/health tourism by the truly feckless
EU-wide standards for products such as those of my previous financial startup and my current energy saver; I only want to have to develop and certify/comply once, not 28 times, to reach a half-billion-person market
Eventually something like the Euro, when everyone has stopped cooking the books, ignoring rules that they invented but now don't like, putting in their own placemen in positions of authority, sabotaging it for short-term domestic politics, and so on; a widely circulated dependable common currency seems to serve the US well...
Maybe not much more political union for us unless/until the views of UK punters converge with those of the EU 'core' countries; no hurry on this one since there's scope for more integration in fridge-freezer efficiency labels and Daily Mail compulsory outrage than in many other of the 'social' aspects that might make some squirm.
I changed my votes in the recent London mayoral elections based on the candidates' Brexit positions because my livelihood depends in part on their actions, but I wonder if I wasn't being a tiny bit tribal too?
It is said that the rise of nationalism and more extreme populist positions is fuelled by the poorly-performing global economy since 2008, on the entirely understandable basis that if you're not feeling well off you're less likely to feel generous to others not exactly like you.