Perhaps it is narrative karma on Hara's part?
The Kanki Army have always been portrayed as complete scum so Hara might have decided not to give any of them dignified deaths.
Zenou, the main muscle of the Kanki Army, isn't being given a respectable end where he finally falls after he smashes an important enemy or is used to hype a bigger threat thus displaying one last act of his might. He is just being turned into a giant pin cushion.
Raidou's death, which did have the respectable angle of him not betraying Kanki, was hella undignified. The bloke got turned into meat chunks.
The rest of Kanki's officers could be on the undignified chopping block too.