David makes a good point about "securing" un-used wire ends.
I usually fill the end of the but splice /w silicone (one of the few uses I make of R2SiO), and install a clear heat shrink over it & the label (we do label ALL wires, don't we?).
If you're going to "pinch off" the end, make certain the sleeve insulator is Nylon (NOT Vinyl).
In the pictured female connector (boat side), the problem (& fatalities) resulted from the miss- connection of the ungrounded AC "Hot" supply wire, to the boat's ground, not from the unconnected ground conductor.
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"