BTW, nobody is arguing (much) about the immigration statistics. The numbers are the numbers and are reasonably well accepted by both sides (admittedly, the future immigration numbers are more disputed however). But on immigration, at least, the heart of the debate is over whether it's "uncontrolled" or not, "too much" or not, and whether or not anything can or should be done to remediate the situation in future. You don't find the Remain side saying "actually you'll find only 5000 people came in last year - trust us on it".
But the Vote Leave camp dispute every economic projection, and treat all data and statistics with disdain, while providing zero fact-based evidence of their own. That's simply not a rational approach. It shuts down dialogue, because it's impossible to have a meaningful debate when the other side just says "No." "Nope." "You're wrong." "Absolutely not." without reasoning the case for the contrary position. It sandbags all discussion. No wonder Remain are getting frustrated!
This thread is a perfect microcosm example of what I described in the previous paragraph. There's been some discussion about immigration, a little about sovereignty (less than some contributers would like, granted) but I have yet to see anyone who favours Leave say "I can see how that might be true" about anything whatsoever to do with the economic, financial and trading future of the UK.
And the answer to an economic point is not "but... immigration" or "but... sovereignty." Neither immigration nor sovereignty issues invalidate the economics of brexit. They're all separate considerations that arise as a result of the UK's EU membership, and its possible rejection of same.
Had the economics of brexit been given a fair hearing by both parties, then:
A) The campaigns would not have become nearly so catty and ill-tempered and desperate as they are now
B) The Remain camp's position would have been bolstered (fairly) on the economic argument
C) It would be easier to take the Leave camp's concerns about immigration and sovereignty seriously and address them with the importance they deserve, because they'd demonstrated rationalism and that deserves rationalism in return