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If Ment believes that Kreation is a Mafia member, and we execute Toria (who is likely Mafia, based on Ment's analysis), who will Kreation kill at night? There's a good chance that the attack will target a Town member (62.5% probability, as there are two Mafia members (Spir dies at the hands of Villain) and one other potential killer). Of course, there's also a chance that both Discord and the Mafia will decide to eliminate Kreation, thereby "saving" the lives of two Town members. In that case, Kreation could use the "wall" ability to protect himself (which would guarantee him complete immunity), and therefore survive. However, if we let Toria live, and Kreation decides to go after him at night, and the Mafia and killers do attack, there might not be any casualties on the Town side...
In short, if we DON'T execute the likely Mafia member Toria, but let him live, the Town's chances of surviving the night will increase. Although, I might have missed something.