Your posts are contradictory.
First you say, "forgive and support your wife," and "do your best to ignore the lip flapping posters who suggest that you dump your wife".
Then you say, "If you don't or cannot trust your wife, then why are you still married to her?" and later on, "My simple question is this. If you cannot or will not trust your Thai wife, then why are you still married to her?"
Well he did trust his wife and she stole almost $25,000 USD from him and jeopardized his ability to stay in the country. She didn't talk to him about the issues she (or maybe her daughter) were facing and she left her 75-year-old husband at risk of being forced to leave Thailand. That is a huge breach of trust and I doubt that anyone who hadn't taken leave of their senses would continue to trust her.
So which of the two pieces of advice you have been giving, regarding his wife, are you suggesting he follows, (1) forgive and support his wife or (2) divorce her because he can no longer trust her?