The alternative view is that without rail it would be harder for those individuals to bring their high pay checks back to Rhode Island to spend their money in the local economy.
That would be true if people moved there because of the stop. I'm not sure Pawtucket is a big draw for either families or singles. I am sure that if there is parking, people who already live in RI will use it to commute to Boston to create real wealth for Boston companies while hoping for marginal trickle-down wealth for RI.