They aren't responsible for creating jobs, they may well be responsible for lowering living standards of benefits claimants. You ay consider that to be homelessness and starvation, I don consider that to be the case.
If benefits are calculated at subsistence levels and housing benefit calibrated below most rents, how can you think cuts will work? How can people eat properly, heat and light their homes, and pay rent, when the money is too low to make that possible? Honestly: how much money do you think people on income support actually get to live on? Where is the room for cuts? And bear in mind that most landlords won't accept tenants on housing benefit, because insurers tend to refuse to provide cover for them. If you cut housing allowance available in that situation then you also narrow the already small pool of available housing enormously, and mean many people will be evicted from homes they can no longer afford (and if they go voluntarily, they'll be deemed to have made themselves voluntarily homeless, so the council will have no obligation to help. Nice for the landlords in question). How can that do anything but increase homelessness?
Very, very few people actively choose to be poor - it's not pleasant! And cuts on working tax credits and child tax credits mean you are hitting employed people as well as employed, I may add - loads of claimants of housing benefit ("local housing allowance") especially in London work! Those are people on very low incomes, who are busting their guts to provide for their families already. What, you think Cameron will increase the minimum wage enough to make up the shortfall? Cut taxes for poor working people? How is the gap to be filled, if you think benefit cuts so acceptable? And how are people to avoid homelessness if they aren't paid enough or subsidised enough to live?
I have to ask: have you ever been properly poor? Lived on benefits, in a place you can only afford with housing benefit, without family in a position to help out, and provide extra funds when things go tits up? For more than a year or so? I'm bloody lucky, in that that's not been my adult experience. It was my childhood one. It was shit. And the idea of applying additional pressure to people in that situation, in a terrible jobs market... it's morally indefensible, IMO.