There’s a deficiency in appropriate love. Too much love of self not enough love of others.
True; but there's still a deficiency of love: see the underlined portion.
And, it may be that the love of self is not in itself bad; after all, the second great commandment is to love your neighbor as yourself.
And if we humans are made in God's own image then we should consider this: the Father loves the Son, and the Son loves the Father, therefore God loves God.
And if that be the case, then there is some reason for us to love ourselves, no? (Indeed, that other men are created in God's image ought to be enough to love them; how then can we be told that we, also in God's image, ought to have no love for ourselves?)