//Why did you vote to remain in the EU? //
a) Fundamentally, the continent faces a choice about whether it goes back to the "state-of-nature" politics of the late nineteenth/early twentieth century or whether they collaborate to make something bigger than any individual member. I find the latter more appealing, because the former doesn't work particularly well over the long term and is not sustainable. Notice, by the way, that I don't think doing it the second way has to - or needs to be - perfect. It just needs to be better than what we were doing 100-150 years ago. On balance, I think European politics is better for all concerned than it was then.
b) I felt that if we voted leave, then there was too high a chance the government would ignore the safer options of EEA membership and instead pick a fight with 26 other countries with, essentially, nothing whatsoever to negotiate with. That is, in my opinion, what has happened. It won't end up being good for the UK, but in the long run we'll survive it in a way that we wouldn't if the vote was reversed now (my argument above).