It has been a while since I posted something about the need for preachers to preach on the Ninth Commandment, and for that matter, on the lex talonis ("an eye for an eye"), a Year D text.
The point is not to reinforce or revert to "an eye for an eye," but to show the rationale for it, namely, that it serves as a warning—ideally, one time only—against "false accusation" or "bearing false witness," or for that matter, psychologically projecting your own prejudices onto people you falsely cast as bigoted.
Here is one whopping illustration.