Why?

'I want my children to live in peaceful times. I do not want to get them involved in the underworld.' But, in order for there to be true peace, she has to root out all the evil. There should still be some time left. 

"The Holy Knights, with an entire organization of killers trained since they were children, are incapable?" Hino repeated in disbelief.

"Right, they are a useless bunch." Sumire trailed off. "But your information network is amazing; how did you find out?"

There are a few skilled individuals, but most of them only know how to kill and leave nothing behind. On most occasions, that would be fine. However, there are circumstances that call for keeping the targets alive.

'I should call a cleaner later to take care of them.' Although she has been doing jobs for Aki, she hasn't been killing anybody. Killing when she is pregnant is bad karma, after all. She has been using rubber bullets instead of lethal ones.