Er, when you unload a .30-30 lever with just a half-notch safety, you are not suppose to have your trigger finger up inside the trigger guard portion of the lever. Of course it could go off.

Your are suppose to just put your thumb inside the lever loop, squeeze your hand tight, and work the lever briskly, with the rifle pointed down into the ground in front of you

Or, you can just put your last three fingers in the lever loop, and leave your trigger finger totally outside of the lever and pointing down to the ground. Very safe.