Guillermo, here is a direct answer on this very question by Mas Ayoob, from the firing line forum, 2005-12-01.
"Anyone with a three-digit IQ knows that unscrupulous attorneys may come after them with unmeritorious arguments in the wake of a justified shooting. Telling them "Aw, don't worry about it" is kinda like Sarah Brady telling people, "Aw, criminals won't come after you. You don't need a gun."
People know the crap load of trouble they can get into after the most justified shooting. It can make people hesitate long enough to be killed. That's why I make a point of educating folks how to deal with the aftermath, so they'll know they can get through it and not die from fatal hesitation in the moment of truth.
Why do you think you won't find a reputable gunsmith who will remove a safety device from a firearm? Did you think I scared them? They know what is likely to happen in a litigious society when a money-hungry plaintiff's lawyer or a politically-motivated prosecutor goes after someone who was in a "clean shoot" and tries to make them appear reckless and irresponsible.
The jury will have been cleared of knowledgeable gun folks during voir dire, the jury selection process. When opposing counsel presents their "theory of the case", they will need to establish recklessness. Removing a safety device from a lethal weapon plays right into their hands.
You, the shooter, now have to convince the jury that you know more about the gun than its designer and manufacturer. Pretty high mountain to climb.
In a manslaughter case in Miami some years ago, famed defense attorney Mark Seiden did a case in which the prosecutor made a big deal about the deactivated magazine disconnecter safety on the defendant's Browning Hi-Power, which was in his car at the scene but was not even the death weapon. The case was plea-bargained, and Mark prefers that his client's name not be used to spare him further humiliation, but Mark himself will confirm that it happened.
Haven't personally seen a case involving the S&W lock, but the same principles would undoubtedly apply. Personally, I just make a point of using pre-lock models for my J-frame carry needs.
Decision is yours, folks. It's your life and your future. But get all the information and make a fully informed decision."