Basically it comes down to "people who don't count". Or as Thatcher put it "not lone of us".

The trouble is, that is also true of Labour and the Lib Dems, but they just use marginally different criteria for who belongs in the charmed circle. Better, but not that much better - though the difference does matter.
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The bedroom tax is peculiarly nasty. For example it means that an elderly widow receiving housing benefit will be penalised for having a room in which a daughter or grandchild can sleep on a visit. A person with a disability will be unable to have a parent come to stay for a visit.

It's the kind of thing that disrupts families, and damages informal sharing and help within society. It's hard to think of anything that is more liable to destroy "The Big Society" - though I have no doubt they'll do their best to think up something that does.