Oh the `good` people of these `countries`. By what yard stick do you measure `good`. These `good` people considering it normal. I think you need to stop bringing your naive viewpoint of the West to Asia.
Do you really believe their wives and girlfriends are princesses who are innocent little delicate snowflakes that need your manly protection? You're getting played my friend with the oldest trick in the book.
There are some viewpoints like which is the best kind of bread that you can leave to personal taste, but if you view something as evil and let others off for it just because they are different then you might as well have no morals
Edit: Also your insinuation that I find cheating bad only because I'm some kind of White Knight is uncalled for. There are certainly Thai women that cheat, but it's not part of their culture to treat it as a standard and necessary part of business. People will make mistakes or just be bad people, but normalising that is not ok
Have a nice day.