That was intentional. The decision, as I see it, was far from simple.
At least one of the other TITAN authors disagrees with me that non-interference with cultures deemed unready for first contact is the most important principle in the Starfleet canon, considering that view to be paternalistic. Obviously, while I also believe in a more flexible application of the the directive, I do not believe it's inherently paternalistic in principle.
The discussion and the friction inside Riker was partially BECAUSE he's the captain now. It's easy to hold the more flexible opinion when it's not you who has to make the final choice. Simply making a phone call could, in this context, destroy an entire planetary culture. Weighed against that, the lives of one starship crew don't matter much. And they shouldn't.
Also, something people seem to forget, in their problem with his problem, he ultimately chooses to go ahead and contact the new species. I just made it an actual decision based on thinking rather than whim.
It's been expressed in this thread, and I agree, that the criteria for First Contact are too narrow as they don't take into account what a given species might WANT to do, rather than what you arbitrarily deem them capable of. The Orishans are an example of precisely that.
I wanted to show Riker actually thinking about it instead of just waving a hand and saying, "Yeah, they haven't met any aliens yet and they don't have anything like warp-centric space travel but, hey, they've got a VERSION of the tech and we're in trouble so lets save ourselves by contaminating their society."
Awesome.
No way.
I don't see Will as a frivillous person and I don't see the argument as out of character. Deanna and Vale function as Will used to function in his old role, providing the two counter arguments to Starfleet's rigid party line.
And Deanna, in particular, expresses a similar sentiment to that which some readers had with Will's response. She and Vale tell him why he should do what is in his nature to do. Clearly he wants to do it but feels constrained by the rules and his desire not to do great, perhaps irreparable harm to an innocent culture. I think that's a big freaking deal, myself. Mileage obviously varies.
I know some folks think Will getting the big chair means he gets to do whatever he wants but, as anybody who's got to be the boss knows, there are a lot more restrictions there to go along with the increased powers.