Elrond

[the phantom]

Glorfindel did not heal Frodo's wound. As I recall, he merely made his ride to wraith world more comfortable.

There is little evidence to support that he felt torn apart

Remember my HoME quote-

And the Eldar deemed that the dealing of death, even when lawful or under necessity, diminished the power of healing

Tolkien stated that the Elves think that the two (killing and healing) are not completely reconcilable, so yes there is evidence.

Now this doesn't mean that a warrior can't heal, it just means that a warrior can't heal as well as he could if he were to abstain from killing.

Are you winking at me, Finwe?