I think he misses the subtleties of Epicurus' language:
From the letter to Pythocles; "The size of the sun is to us what it appears to be, and in reality it is either greater or less or the same size."
"Death is nothing to us; for what has disintegrated is without perception, and what is without perception is nothing to us."
It is not principally a question of harm, but of experience. And just like with the size of the sun, a different perspective yields a different perception. The death of a child is a horror to his mother, because the mother still exists as a subject whose experience is modified by predicates. The child? No subject; therefore no predicate.