While I appreciate your enthusiasm, I must point out that breaking legs is, really, rather inefficient, if we wish our clients to be able to pursue their rather active lives in order to immediately repay their debts.
Mosley was a Lieutenant during Sheriff Truart'sWatch. Unlike the Sheriff and Lt. Hagen, Mosley was a good cop, an idealist, believing in The Watch and her role in it. Under her command, crime was fought not only harder, but smarter, by arresting bookkeepers and fences. The downside to this is a heavy naivete, where Mosley doesn't understand that Truart is indulging in prostitution, or that her secret Pagan contact is plotting to kill her.