You have provided a quotation in your post from what appears to be a state bar association or some other organization. You have not provided the source for your quote, but seem to be
falsely attributing it to the ABA. In brackets, the quote mentions "State Rules of Professional Conduct" which themselves could not be the Rules of the ABA, but rather, at most, official rules based upon such model rules. That quote does not appear to originate with the ABA, which is the American Bar Association*, a private but important group that is a voluntary association of a relatively small number of lawyers (about 1/3 the US total number of lawyers)** in the US that has no official government responsibility. In the US, each state has its own method for officially certifying (legally qualifying) the professional status of lawyers, as does the federal government and each of certain specialized aspects of federal jurisdiction (for example, patent law).***
Thus, your statement about the ABA sanctioning its members who do not follow a voluntary practice suggested in its Rules is false. Perhaps this falsehood was the result of insufficient research and excessive assumptions, or perhaps some other reason.
You have not provided any connection between your discussion of pro bono work by US lawyers as suggested by the ABA or possibly required by some official state organization and the Knox - Sollecito case insofar as I can determine. I suggest that if there is no connection to the thread topic that the discussion on pro bono work by lawyers in the US that you seem to have initiated be discontinued in this thread.
* "The American Bar Association (ABA), founded August 21, 1878, is a
voluntary bar association of lawyers and law students, which is not specific to any jurisdiction in the United States. The ABA's most important stated activities are the setting of academic standards for law schools, and the formulation of model ethical codes related to the legal profession. T
he ABA has 410,000 members. Its national headquarters are in Chicago, Illinois; it also maintains a significant branch office in Washington, D.C."
Source:
https://en.wikipedia.org/wiki/American_Bar_Association
** "An attorney at law (or attorney-at-law) in the United States is a practitioner in a court of law who is legally qualified to prosecute and defend actions in such court on the retainer of clients. Alternative terms include counselor (or counsellor-at-law) and lawyer. As of April 2011, there were
1,225,452 licensed attorneys in the United States."
*** "In the United States, the practice of law is conditioned upon admission to practice of law, and specifically admission to the bar of a particular state or other territorial jurisdiction. Regulation of the practice of law is left to the individual states, and their definitions vary. Arguing cases in the federal courts requires separate admission."
Source:
https://en.wikipedia.org/wiki/Attorneys_in_the_United_States