One possible scenario is that the parents aren't convinced that you will come back and marry her. On the other hand, there's a local guy, over whom they have some control, and he appears to be more than willing.
Another point is that western guys have a reputation (unfair?) for taking asian women and (mis)treating them as slaves.
Before Ruby came to the UK with me, her father asked her what would she do if I started mistreating her once she was away from home.