China, I presume. But why would they not see the inside of jail? No justice in Thailand or are they feared? or favored?
The country is 10-15% chinese. The only chinese rich enough to travel abroad are rich therefore very likely political. Loads of chinatowns, loads of chinese so they can keep it in the community whereas a westerner would go through someone they did not know/had no relation with. Most times the westerner's pimp friend does a deal with the police and gets some more cash. The papers have a field day and everyone gets to point out how wicked westerners are while ignoring what the other 95% of residents get up to.
On the whole a very nice country but with it's faults.
And to be fair it took the west a long time to deal with the problem, or even recognise it. As the country grows economically they become more educated and hopefully will do more about it. They are trying to get rid of this child-sex image but seem only to concentrate on westerners (which is still a good thing - Thai prisons are notoriously bad so the right place to put these people - but they should widen the scope a bit more)