Our system is a truly adversarial one, as opposed to courts in civil law countries. Our system is more concerned with giving people an opportunity to make their case, rather than doing everything possible to make sure we find the truth in every case.
As long as we "have our day in court" - one that is condicted fairly - we've gotten all we should in the American legal system. As such, the judge and/or jury does not sit down before the trial begins, deciding what is and isn't at issue. The lawyers build their cases and present their arguments - and any good attorney will make any point he can.
After three long years, I graduate law school in a week. Please know that an attorney will exploit any advantage he perceives in a case, period. This is not a matter of "slimy lawyering". This is, literally, his SWORN duty - to "zealously represent" his client (quoting the model rules of professional conduct). The system works because there is another attorney, on the other side, doing the same. What we may think of as "fair" has F-all to do with what's going to happen in a lawsuit.
None of us can know how we're going to react to these situations. There are any number of them in which the IL - or any other feature of the gun - may be called into question/scrutiny. What if, at any point in the immediate aftermath of a defensive shooting, you're still shaking from the adrenaline letdown, and you say something even remotely like "I didn't mean/want to shoot him". MOTHER OF GOD - if anyone hears anything like that, you'd better believe that the disabled IL is going to become an issue in a hurry.
To those who wanted an example/analogy - let's use a simple, law school one. You're cutting your grass. The mowed has a guard on it, to protect against debris that gets kicked up by the blades. However, you find that this guard doesn't let you cut as close to the house/bushes as you'd like, so you remove it. A year later, a rock gets kicked up and the little neighbor boy has his "eye put out". Your "improper modification" of the mower will 1) likely indemnify the manufacturer of the mower, and 2) likely become the new centerpiece of the discussion/trial regarding your negligence.
I'll just lay my hands on a "pre-lock" gun, or choose a new model without one.