Actually the 'spawning' concept goes rather well with Movie Saruman's breeding pits. The female(s) lay eggs which are fertilized by selected males and the result grows to maturity inside those muddy pouches. No 'childhood' and no family life of any kind.
If I recall correctly from the HoME Tolkien recognized certain, shall we say theological difficulties with the concept of Orcs as corrupted Elves, or Men for that matter. In either case they would have souls and so could *not* be automatically and irredeemably evil - which Orcs definitely are. Orcs therefore *must* be souless, possibly animated by minor evil spirits or the power of Morgoth.
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