It amaze me every time, that it seems like Thai people can suddenly just go kill, and there is always an excuse. He didn´t tolerate high volume or he had been drinking. I don´t get the urge to kill when I am drunk. It doesn´t matter how drunk I am, which I assume goes for most persons. Here it seems like a normal thing for Thais, and we never read anything about that they might be, or is, mentally disturbed or have mental issues. However, as soon as a foreigner walks around a little bit angry and screaming in a street, then there are big reports about how disturbed that person is. For Thais that kill, they are just described to be in a fit of rage or as it would be an effect of drinking or taking other substances.
As an example we have the text above. It should be: A crazy noodle shop owner with psychopathic behavior took a knife and deliberately killed a Thai woman and a Canadian man.