The most dangerous dogs are those who have a stupid and bad and above all aggressive owner and the dog resents this and thinks that it is his duty to attack because his owner wants it that way, this is true in every country, this is part of the psychology of the domestic dog.
The free dogs that I see are well cared for with enough food and water and therefore are not dangerous to anyone.
Despite what has been written above, Thais treat their dogs well.
The OP definitely has a psychological problem that only a psychiatrist can help him with.