From the BBC:
In a recent speech, Mr Cameron warned that politicians should not be afraid to spell out right from wrong. Failing to do so meant "a denial of personal responsibility and the concept of a moral choice".
"We talk about people being at risk of obesity instead of talking about people who eat too much and take too little exercise," Mr Cameron said.
"We talk about people being at risk of poverty, or social exclusion: it's as if these things - obesity, alcohol, drug addiction - are purely external events like a plague or bad weather."