Everything has to start somewhere. Yes, IPT got started through a doctor in Mexico, not at a US medical school, not at the NIH, not in a pharmaceutical company lab. And yes, there have been no large placebo-controlled trials. For those who wish to wait, IPT will eventually come through your favorite channels, with all the trimmings. IPT comes from Mexico .
Doctors there have no regulation and are all quacks.
A famous actor went to Mexico for cancer treatment, and he died. Yes, I have run into a lot of blatant prejudice and faulty logic about Mexico. These embarrassing memes are more common in the US than you might think. I have even heard them from well educated US doctors. First, it was a historical accident that IPT was discovered in Mexico.