Yuma should shoot because his role was designed to shoot, town learns things through night actions, and the opportunity cost is not so high that he shouldn't shoot.
The Setup
I can just imaging ashersky in his mod qt hoping that Yuma will shoot. It is a role he crafted for use in this game. We don't know what other roles it might compliment or what roles it might counter or anything like that. Yuma's role was not created in a vacuum. We don't know any of the other roles, and more importantly we don't know what types of powers scum has. We don't know if this is a 3 scum +1 third party, or what. Whatever it is, this role does not break the setup. And this role was designed to be used.
The benefit to town
Using PRs is beneficial to town. Why? Mostly because you can catch scum in their lies. I mean, cops and doctors and stuff do great things, but when everyone eventually claims on D3 or D4 or whenever it eventually happens, we need to have data to go back on. We need the tracker to tell us who he tracked. We need the cop to give his results. We need Yuma to have shot people. This gives us the full picture of the setup and gives us the best opportunity to catch scum in their fakeclaims.
The opportunity cost
Yeah, yeah, yeah. Math people have run the numbers. It "isn't beneficial" to town. But really? I mean, as yuma just mentioned, the mass of people that we have right now makes it difficult to nail down reads. Everyone has been posting and there is a ton of content to go off from D1. One more person's reads that can be confirmed town or confirmed scum might be huge. Even though yuma might hit town, having everything they have done on D1 confirmed to us as town might just be that key ingredient we need to catch scum. So I believe there is an intangible benefit that the numbers do not accurately portray. I mean, benefit of hitting scum is obvious. Benefit (well, not really benefit...maybe...upside?) of hitting town is to confirm someone's play and help PoE. This last point is not meant to be what puts people over the edge to make them think this is the best thing in the world, but more of an argument that the world won't end if yuma shoots. Even if he shoots town.