And finally, everyone here -- being Canadian -- looks on this from the perspective of foreigners tricking honest Canadians into marrying them, and then escaping to live on their own, eat up social services, and cause their sponsor financial and personal heartbreak. It's true, that happens. It also happens when Canadians marry Canadians, and in that situation, it is not usually thought of the responsibility of the government to protect either party.
However, from the perspective of someone who has lived in SE Asia for many years, married a woman from there and who speaks Thai fluently, the opposite happens as well. Many of the men who marry Thai women are, quite frankly, controlling and socially warped. They believe that Asian women are submissive and subservient (in Thailand the opposite is more true), and that they are marrying a 'traditional' woman (which means that she is a combination of a maid and an unspoiled sex object).
In Thailand, conversely, traditional marriage is considered somewhat transactional. There is a dowry that the man pays to the woman's family, and courtships are usually quite short. A foreigner can get married very quickly, without even sharing a language, and neither he nor the woman have experience living with each other. When she lands in Canada, she is isolated, speaks no English, and for the first time has to fit into her husband's idea of what their life is like. Abuse in this situation is not rare, and the costs to her to go back to Thailand can be quite high financially, socially, and emotionally.