You say: “I am full aware of the precept that God is love and that he created man out of his great love, and I am not disputing whether either of those is correct. I do though have to wonder if he did not also create the Angels out of that same great love, and would not the loss of them not be as sad for him as the loss of a man's Soul”
Generally I find that when further understanding is needed in regard to God, expansion generally is found in our understanding the nature of God's Love.
The fall of Lucifer was as a result of Lucifer’s misplaced love for himself. God “loves” us and we are to return that “love” to God. Love is acquiesced by “faith”. Adam and Eve placed their “faith” in the word of the serpent rather than the “loving” word of God. “Grace” is God’s unmerited “love” for mankind.
Romans 4:16 Therefore it is of faith, that it might be by grace…
Faith is essential in a loving relationship. God certainly is Eternal and knew outcomes at beginnings. Lucifer also was created as were the angels for a loving relationship with God. Their relationship we know is not the same as God intends for man. Lucifer transgressed faith and faith was transgressed in the Garden. Faith is transgressed when it is misplaced. God’s love is the intended target of faith, self-love (pride) and sensual-love (lust) for example are counterfeit targets of faith.
Many wonder why an Omniscient-God would have followed through with Creation knowing outcomes of heartache and loss. This does enable us who have invested our faith in God’s love, to know the inconceivable value that God places on those that will trust in His Love and engage in a loving relationship with their Creator.
We are linked to the Spiritual Reality, and certainly mankind has been and is affected by Spiritual happenings. We can however take personal inventory of our heart’s treasures, those things that matter most, those things we trust, those places we invest our time, they are the target of our faith.