I worry first about not making any tragic mistakes, and for me that means having a trigger that I can control. 4 lbs is my lower limit for a carry gun, but most of them break at between 4.5. and 5.5 pounds. But a really crisp 7 lb trigger on a 1911 doesn't necessarily suck, either.
As pointed out, unless you make a terrible mistake, and claim an accidental discharge, you are probably fine in the range of trigger weights I described, IF they are controllable for YOU.
Massad Ayoob has strong feelings about this issue that are somewhat at odds with mine. His writings on this subject are well-worth your consideration, as he has a lifetime of experience as an expert witness in defensive shooting cases.