You seem to think that the tearing down needs to be logical, when I have repeatedly said it rarely is:
Research happened for centuries without the EU, it's all just different pits of money and (truthfully) my favourite job was EU funded and when the initial funding term was over we had to change the nature of the work drastically if we wanted another EU round. So we didn't, we made other provision. Reliance on one funding stream has never been a good idea!
Immigration has been a lie on both sides, Cameron continued to lie long after Farage and others pointed out he was the only person in the UK that believed his lies, reducing immigration to 10s of thousands was never a realistic target and, had Cameron stopped whipping up that fervour, wouldn't have become such a cause... and no, I would want a meritocratic immigration procedure... skill based, as I believe many Leave campaigners said, often and loud.
Northern Ireland will only become bloody again if the people in any part of Ireland allow it. If the peace is that fragile it would have erupted in any case... there have been signs of that for the past couple of years, Brexit did not cause them!
And we have no input into EU laws. There is an unelected council which makes all the decisions - and now we a know what one of them looks like!
There is a whole world out there, a number of other, wealthy countries have already indicated they would really like to treat with us without all the EU hassle. We may even be able to pull together the Commonwealth again... should anyone remember the reality of that!
I know what you will say... I have read what you will say so very many times here over the last few weeks.