I fully agree with OP's view. However I don't think OP has been clear and I think a careless read of this implies it is benefits scroungers who are costing this sum, not the tax dodgers
So to be clear to other visitors to the thread, the point OP is making is that tax dodging costs the UK government many many many times more than benefit fraud. So let's chase the tax dodgers rather than demonise those who claim benefits fraudulently.
I must admit I don't have the first idea why people would rather report their dishonest benefit claiming cousin than the tax dodging small business that offers them a cheap bathroom for cash, or rather than avoid Amazon
But there we are