you are totally right. Most people don't seem to realize that, while they think safe because the existence of a double treaty, in most cases, due to the difference of the exempt income bracket, they will have to pay full tax amount in Thailand.
in short "we" and probably "they" don't know anything about the real ray of spreading. The winds are blowing South since a week and are announced to continue in that direction for the coming days. Better buy a Geiger counter yourself if you want to know if you are concerned.