Ok FlyTrapNewbie, put your daggers away. Life is far too short.
Perhaps I should simplify my comments by saying you should stick to feeding your plant 'arthropods' only and leave it at that. If feeding your plant bits of earthworm can potentially and most probably kill the trap on the plant then you can make the choice yourself. Most of us wouldn't risk it. Incidentally too many people are under the false impression that vft need to be fed insects on a regular basis in order for them to survive or grow better. They do not. Although they benefit from the extra nutrients gained from such meals, it is not necessary for maintaining good health. Cultural excellence combined with the correct combinations of soil, light, heat, water, etc.. are the primary key ingredients.
Side note: I'm not saying they don't need to be fed insects, only that if you don't have anything to feed your plant don't sweat it. They will not die on you. If they do then some other environmental factor is at play here.
I know this from the experience of growing tens of thousands of vft. I have conducted extensive research with control plants that were grown for a minimum of 5 years without so much as a single trap being fed. These plants showed no ill effects nor any signs of weakening as a result. Of course I did repot them annually and removed all flower spikes on a regular basis.
Oh yes BTW... in the past several of my 'larger' plants have dined on tree frogs which have blundered into the traps, as pointed out to me by some of my shocked visitors. The traps on these plants average in the 2"+ range and the frogs are rather small, but the plants are growing outdoors in full sun in what I would consider optimal conditions. In order for a plant to successfully digest such a meal or anything richer in nutrients than an insect without rotting, it must be in excellent health first. So feel free to experiment away and let us know what your results are.
endparenthesis: "A worm doesn't have a nervous system remotely complex enough for agony"
I'm not so sure. Earthworms have a brain, a nervous system, 5 hearts, a gizzard, intestines, a bloodstream and some of the most advanced skin cells in the animal kingdom. They are one of the only life forms known to secrete 'opiates' in response to aggressive external stimuli or injury. These 'opiates' functionally mediate analgesia - the inability to feel pain while conscious, which is why they wiggle around so much when they are lanced with a fish hook. Scientific evidence supports that they are trying to 'numb' the pain... for lack of a better term.
Just some food for thought.
Phil