Those killed in war have been experiencing this human environment. Those who have been aborted were virtually unaware of this human environment and since I believe that God is infinitely more powerful than mankind, I believe that if that unborn child is meant to be here, that will happen in one way or another.
I don't believe that our existence starts when an egg is fertilized - that is a human function; God is spiritual and He is our Source, not a material human function. Likewise, I do not believe our existence ceases when we experience human death. If we are eternal (as God's children were created) then we have no beginning and no ending - only changes of environment and experience, ultimately realizing our spiritual nature.
This juxaposition of abortion and war is ultimately unhelpful to forming a judgment about either one.
If “we” had no beginning, how is it you call God “our Source” or Creator?