They do suspect Kir, the difference is that they can use this for their own advantage to take the FBI and CIA out. They can manipulate info Kir finds out and if the FBI and CIA acts accordingly they will know Kir is off base. There is no reason to be hasty. This is why Bourbon is here, to investigate the FBI, Akai, and what happened in the last clash. I don't think they care as much as they used to about Sherry, that's Gin's problem.