Denied Transit Visa while holding a US immigration VISA

[JohnnyUlysses]

Explain to me the rationale of denying a transit visa to a Russian citizen with a US immigration VISA and with letter from the US embasy stating the individual needs to immigrate to the US by certain date to receive their permanent resident card. An individual married to an US citizen, which they were currently living in together with their child in South Korea. Reason provided for denial: applicant did not provide sufficient evidence applicant would return to country of residence.
Well, that is correct, as they have provided a letter and visa from the US gov indicating just that. Of course that is because the documents show they are legally immigrating to the US with their spouse and child who are US citizens. So it appears the agent processing the application is concerned that during this 4 hour flight transfer the applicant may abandoned their chance to legally immigrate to the US and instead try to illegally stay in Canada? Though the person has lived legally in South Korea for over 4 years and has traveled to various countries in the EU without incident. I am certainly not able to see the processing agents logic, so please help explain possible red flags I'm missing.

Thank you.

 

[Buletruck]

Why would you fly through Canada when you could get a direct flight to the US?

The reason for refusal is pretty obvious (at least to me). In order to qualify for a TRV/transit visa through Canada, you have to show you will be returning to the country of residence. You are leaving Korea (I am assuming where the flight originates from) permanently and immigrating to the US, where you don't have any status (as yet). Until you become a legal resident of the US, you don't have any ties there. Nothing to say you won't be refused entry to the US once you get there (hypothetical).

 

[bellaluna]

Why would you fly through Canada when you could get a direct flight to the US?

This reason sums it up, IMO. There are plenty of flights out of South Korea that land directly in the US. The TRV application fee should have just been used to pony up the additional fees to book a flight that lands directly in the US.

 

[JohnnyUlysses]

Thank you. I didn't know you had to return, especially when you have an immigrate visa for the country in which you are traveling . Anything is possible but it is highly unlikely an approved permanent resident would be denied entry. But if they did, how would that be a problem for Canada?
When one has a US passport there are only a few countries, Russia being one, where one has to plan to get a visa prior to travel. Again, thank you for your response.
And the reason was not mainly cost, it's because Air Canada had better reviews than some US carriers. Several other airlines, which did not require a transit visa, had cheaper tickets. Yet, if you are on a 12 hour flight wouldn't you want a decent airline.
Oh and guessing some folks don't know the cost of requesting a Canadian transit visa based on their comments about using that money to book a direct US flight. It's free, if you are staying less than 48 hours. Again, thank you. I appreciate your time.