In statistics, the technical term would, I think, be specious correlation. But more simply put, that doesn't necessarily add up. It is an easy assumption to make, but is not necessarily true.
I almost wrote "his intention and ability...." but thought better of it. My daughter, who works in Local Government in South Wales, wrote a blog about voting and so on before the last election, and she wrote something about politicians of all parties being in politics for the right reasons, but...
I like the way David Cameron pledged to combat poverty etc etc in his conference speech and talking about one-nation conservatism.
I have absolutely no confidence at all, however, in his ability to deliver it.