To be fair, they were never on our plates! :) We wouldn't date them anyway. But, some men mask their intentions well and their true colours only come up after the wedding. Can you imagine not realizing you had a passport bro in front of you the entire time? I'd be horrified.
And I feel bad for foreigners who come here in search of better life and then become victims like that. The only silver lining is they have a way out, and that some marriages are genuinely good unions with decent men who were simply unlucky finding a partner locally.