Haven't got time to answer all your points - need to sleep - but on the first.
I didn't mean that the swimming pool should necessarily be profitable. I meant that there was a long-term way of sustaining its funding.
If council tax is already too high, then although a swimming pool might be a wonderful thing in principle, it should still be cut. (Of course quangocrats, diversity officers, five-a-day co-ordinators, and other various left-wingers should be culled from the payroll first!)
On a fundamental level, though, what I am saying is that we should decide first how much we want to spend on public services, and then decide how to spend it. Instead, governments over the years have done - primarily Labour, but also Tory - is to decide what public services they want, and then worry about how to finance it. It is philosophically the wrong way to approach the matter of public finances.
Quickly on your second point, you do realise the deficit is the annual increase in our debt? So even if all the hypothetical tax avoiders paid £40bn extra a year, the deficit would still be £120bn - in other words, our national debt would rise by £120bn every year.