The father was not prosecuted. Because the judge was one of the family's best customers. Child prostitution is accepted by the Australian authorities by way of their total lack of commitment to end this business. Child prostitution is backed up and supported by the same people who make the laws against it. It's just like the marijuana industry in Australia - do what we say, not what we do.
Same people make the laws profit on the black market.
Thai government, people and culture do not now and have never supported child prostitution. Yes there are child prostitutes in Asia. In Thailand, The Phillipines, Japan and elsewhere. Yes it happens here too. But it is far more insidious and broad-spread in Western countries.