The "sure things" really aren't so sure.
Why ought to consider what we will learn from a lynch.
If we lynch Rafay and he's scum, we can trust Commander Shepard as the Roleblocker.
If we lynch Rafay and he's the Roleblocker, we lose the Roleblocker but know that Commander Shepard is scum.
If we lynch Commander Shepard and he's scum, we can trust Rafay as the Roleblocker.
If we lynch Commander Shepard and he's the Roleblocker, we lose the Roleblocker but know that Rafay is scum.
If we lynch Lyner and he's scum, we can trust Euclid of Alexandria as the Dietician (or he's a scum that luckily picked another scum)
If we lynch Lyner and he's townie, we lose a vanilla townie and know that Euclid of Alexandria is scum.
I'd rather lose a vanilla townie than a roleblocker if we're wrong.
The problem with that approach is if we lynch a scum the confirmed townie immediately is dead (dead scum's partner will hit him). We have no docs so no protection can be given. We have a RB but if we are not sure who the 2nd scum is RB cant neutralise that threat as well. Finally we have the wildcard SK who can kill anyone he wants without dying or being blocked for one more night. So, we should really be taking action that has a god probability of identifying the SK and lynching him. Is Rafay the likely SK or one of the mafia goons? is Lyner one of the goons or is it possible that he is the SK? If Rafay and Lyner are the two goons who is the most likely SK? If one of these two have a good probability of being the SK instead of one of the goons we should lynch him. And we should plan the night with our power roles such that the SK can be identified if Rafay and Lyner are goons and neither is the SK.