'Loan sharks are a different kettle of fish' - Justin Welby on the Today prog. 
He was making a serious point, that if you ban stratospherically high interest rates, payday lenders may shrug their shoulders and move on to do business elsewhere, leaving the desperate easy prey for loan sharks.
Rob, plenty of people on this country are struggling in the economic downturn. Plenty of people have less than they need to live on and are turning to food banks because they don't have enough left after paying rent/bills/transport to minimum wage/zero hours contract jobs. Plenty of people have no hope of saving anything, and have already run through any savings they built up before their employer went bust or laid people off.
If you aren't in their shoes, count yourself lucky. All it takes is one serious accident or being unfortunate enough to develop a serious illness, or your employer going bust, and you might join their number.
That's why he was suggesting the church should help credit unions, co-operatives that lend money at reasonable rates.
The government has abolished the Social Fund that gave people on benefits access to short term loans in an emergency - if your cooker breaks down, for instance, or your water pipes develop a leak, or there's a fire and all your furniture is lost - even Rob would realise you need to replace your children's beds, I hope.