bedroom tax

I've noted with interest the comments about the number of bedrooms now permitted, as from April, by those receiving benefits, and the penalties imposed for those with a bedroom to spare.
I agree in principle that the tax payer should not be funding larger properties where there is under occupancy, but to suggest that people are not entitled to have a 'spare bedroom' is a dangerous road to go down. I imagine that if challenged there would be a case for a 'reduced quality of life' if this were imposed in the way that seems planned.
What about the father/mother who have divorced or split up, but who wish to have their children to stay for the weekend; or the couple where one of them is ill (or snores loudly!) which can cause disruption to the other's sleep? I can think of many more examples where to impose this ruling would be quite unfair. I am am sure there will be many 'exception' cases, but what cost, to us the taxpayers, of policing and monitoring this? Common sense should be the order of the day.