If you are a dolt and have a trigger that is simply unsafe, like a 2 pound trigger on a 1911, you deserve everything bad that happens to you. SMOOTH is important - light not nearly so.
There are going to be some very real context issues. If there is an allegation of a negligent discharge (or a person who freaks out over a good shoot and says something dumb like "I didn't mean to shoot him), a lighter than factory trigger may be a problem. It is a problem only because of an underlying economy sized bowl of stupid, but will contribute to the potentially bad outcome.
I know cops who have had shootings with and do not oppose custom guns, but they are very articulate and know very well what they are doing. The trigger weight should not be admissible in an intentional shoot because it is not relevant under ER 401 et seq. The effort to get it in should be beaten back by a good attorney, as the firearm itself is not evidence unless there is a dispute about who actually fired the fatal shots, and even then, ballistic testing and the like should be done within 24 hours and the gun back to the shooter immediately thereafter.
I understand the comments about the negatives of heavy trigger pulls - also context driven. There are agencies that have specs for their pistols that are borderline insane (*cough* NYPD *cough*) because they are dealing with a generally firearm ignorant pool and don't invest near enough time in the fundamental training. An agency in this state, well known for bad management approaching buffoonery, was going to increase trigger pull weight on their issues pistols due to a couple of incidents of NDs instead of addressing them as training problems. One of those idiots probably should have been charged, and the idiot certainly should have been fired or forced to retire.
Big context issue: Mas developed and validated his views starting almost 40 years ago. The ignorance and hostility that we see in some states was far more pervasive. Very few attorneys were savvy about use of force and defending the good shot. I can tell you for certain that use of force will be about 2 hours of total class time in 3 years of law school, and if you actually know anything about it and have any interest, you will be considered an outlying freak. Nothing about tactics was ever considered, especially 30+ years ago when I was in law school.
Where I live and work, the odds of anyone giving the tiniest portion of a you know what about an offender getting shot are so small as to not matter. I'm in the PAO, and my colleagues in the criminal division would probably cheer. If you have the misfortune to live someplace where you can count on stupid mindsets (CA, MD, MA, NJ, a few others), yeah, you may need to change your analysis. The analysis you make has to take all these variables into consideration.