Let's look at it from Mafia's perspective.
Their almighty goal... Make town not win.
How do they go about this? By attempting to convince third-party roles to vote as they say. In exchange for making Mafia win, Scum offers to no-lynch when there's equal mafia and town until all of the third-parties complete their wincon. Obviously mafia can just break their word at the end of the game, and kill all the town players, either by lynching them or night-killing them. This turns exceptionally easy if mafia have the power they claim, which is the ability of every mafia member to kill someone. So when the teams are equal, BAM! Kill all the town at night, and instantly win the game. But the only problem with this plan is how to convince third party to trust you. You start with offering the fulfillment of their wincon, as without this they would never help you. But realizing that empty promises probably won't float their boat, you decided to also threaten them into submission by threatening to night kill them. Of course you never would night kill them, seeing as they actually have no effect on your own wincon. It would be inefficient to misuse a night kill on someone other then town.
So my main issues:
Their threats against third-party are completely empty, as it would make no sense to kill anyone BUT town.
The scumteam keeps on claiming abilities as the situation requires, and as they get more desperate. First they claim to be able to kill lots of people at once, and now they're claiming to have redirect abilities.
There is no reason whatsoever for the scum team to hold up their end of the bargain.
Also, Shinigami's posts are starting to reek of desperation.