If Everything is Karma, Isn't the Injury That Our Enemies Cause Us Also Part of Karma?

Everything that happens to us --- including all happy moments and joyous events of jubilation --- are primarily because of our own Karmas. Nothing extraneous to karmas could bring us happiness or sorrow. Hence, theories like we suffer owing to our parents' or ancestors' sins are not only inane but also thoroughly unacceptable: no one, according to the laws of karma, can suffer on or in behalf of other, and neither can anyone enjoy even a dollop of pleasure on account of another person's omission or action. Everyone reaps what he sows.

If we suffer because of our own doing, either in the present life or the previous, then the logical question is, can we, therefore, say that the causer of harm to us is innocent as he is but an instrument in the hands of Fate that uses him to make us go through our Karma?

This is addressed in the satsang by Sri Velukkudi Krishnan swami: