If , and it's a big if , the loopholes were closed and everyone paid the same rate of tax then there would be no need for accountants ( higher unemployment ) no incentive to work harder or desire to be altruistic.
I bet there is not a single one of us who would not jump at the chance of paying less tax if we could get away with it especially when we witness how it is wasted but that's human nature I'm afraid .
Personally I think there are a lot more pressing matters than a few bob missing from the fiscal coffers .