I think you've made the point yourself, which is very clear, that we don't prosecute. There's a 94% response rate, so clearly some people are not responding and we're not tossing people into jail.
As for the single mother, the experience to date has been that this has not been punitive. The intrusion—if you want to use that word—is reasonable, considering the importance of the data for governments and the private and the non-governmental sectors.