There is no nuance to the matter that God will reward them. It's not like they pointed a gun at themselves and pushed the trigger: they tried to do good in a rational way and by the light of their conscience. No one can expect three men to barge in, kill the couple and kidnap a child to traffic. That could happen to any family, foster or not.
Why, I just clicked to see the link you posted and ended up with this gem: https://archive.ph/wqrIO
I also used to read his stuff before being slowly repelled away.
What I mean is that getting a greencard via going through college in the USA wouldn't work unless the foreign student had the money to pay the tuition, thereby reducing the number of who can take advantage of that to only rich kids.
We don't get to know the details.