That only reason would probably be enough.
In the hypothetical example with Sol and Vasuda switched, the Vasudans would likely seek to construct a subspace portal to reconnect with their homeworld (and its history). Even more so especially since there would likely be Vasudans still living there.
I merely disagree with what Dragon is claiming.
The Vasudans may not understand the Terrans' reasoning behind why they wish to construct the portal, but I feel that they would understand that if their situations were reversed, they'd likely want the same thing, merely for different reasons. I don't feel that the Vasudans would be content with discarding a significant portion of their population, knowledge, and industrial base because it'd take some resources to get back to them if they were put into the same scenario.
yes, you could make the argument that they're not in that position, but doesn't that make Vasudans sound like asshats if they go "Yeah, if this happened to us, we'd like your help, but since it happened to you, we're not helping you."?