Its not just Americans. In fact many countries are far far worse.
Living part time in Thailand, we can pretty much pick out the sex tourists on the plane and in the Airports. You can’t pick out which are gay or child molesters. Americans, Australians, Japanese, Germans and other Europeans are in the majority although there are some recently from China. They are very distinct from the backpackers / world travelers, businessmen or women and academics. A sense of guilt and shame hangs over some and others are having a drunken party.
There are both temples and Christian organizations fighting this filthy slave trade. The tricksters have pretty much run out their string in recruiting kids except among the hill tribes and refugees. The children of drug addicted, greedy and other sex workers are now the primary source of children though a fair number are kidnapped. Government corruption keeps the wheels of commerce turning in the sex trade as elsewhere.
I believe I’ve read that 10% of American men have paid for sex, while in some countiries like Thailand it’s 90%.