Appletrees you have inadvertently hit the nail on the head.
Indeed the bankers the rich and tax evaders probably could't care less about benefit cheats.
I am suggesting that perhaps you should care a little more about what the rich are up to, as they affect your life more, yet nothing is being done to curb them. Does this not trouble you?
However if you spend your time worrying fraud at the bottom end of the scale, and not questioning what the rich are up to, the end result will be less money in your pocket, more crime, less help from the state should you need it. I'm suggesting that elements within the government are not even that concerned about benefit cheats. They are very well aware that if they create a bogey man in society, then people will blame that bogey man instead of looking at what the real problems are, and the rich cheats will be free to carry on regardless.
This is not paranoia, this is politics. This is a tried and tested method, which the right wing use again and again - if you blame the vulnerable in society for society's problems, the vulnerable usually don't have a voice and can't speak up for themselves, and the public are diverted from the real issues. Pat bogey men have included black people / Irish in the old days. More recently single mothers (remember that in the 80s?) and immigrants.
See this page on victime blaming for more on this idea.
The tories do not really care that much about benefit cheats. They are encouraging this to be an emotive issue because they have an agenda. They care more about cutting benefits in general (as they don't believe in the welfare state) and distracting our attention from the fact they are on the side of the rich and so are going to do nothing substantial to tackle fraud / dodgy financial dealings among the rich, which directly affect you! (See the banking crisis).