I haven't read the whole thread, but my exhusband is absolutely one of the runaway deadbeat dads that Cameron is talking about. He stole all our savings, left me ten thousand pounds overdrawn, got on a plane and flew to Thailand abondoning me and our baby son when he was only 6 months old.
He also left behind two lovely daughters then aged 8 and 11 and whom he had an established close relationship with (or so I thought)
He lied his way into a job over there, pays not a single penny towards his three children, left me traumatised and our son with a horrible legacy. He went to Cambodia and slept with prostitutes and is shacked up with Burmese woman. He is on FB - pictures of himself scuba diving and enjoying sight-seeing trips and eating lush Thai curries by blue seas and white sands.
My son is three now and knows that 'daddy ran away.' 
I would LOVE someone from an enforcement agency - a burly copper or a team of CSA 'debt recoverers' - or the strongmen from Nat West who pursued ME for the ten grand debt instead of him - flying directly to Chiang Mai, hauling him out of a University lecture theatre, arresting him for child neglect, emotional abuse and financial abuse, fraud and theft...and extraditing him to the UK amid a LOT of high-end publicity, and putting him in jail.
So many people have told me over the last three years - 'forget about him. You are better off without him, don't stoop to his level, at least he left you with the house, at least you don't have to put up with bitter weekend handovers..' blah blah. All true quite probably. BUT, he and runaway disgusting men like him should still not be allowed to get away with it. They should be named and shamed and forced to pay a penalty.
If I left my ds in his cot at 6 months and fecked off to live the high life in the med, I would have committed a very serious crime.
So has he.