Now that God could make people, it is reasonable for Him
to do whatever He thinks right, including killing. This is His rightousness, mercy, gracy, love for the whole humanbeing according to His standard. If you chose to believe that He is the God, you do not have power to judge Him, including killing part of what he made and protecting
another part. If you chose that you are your own god, you
can judge whatever you want. (Most of historic wars caused by Christians were not because of God Himself
but becuase Christians thought that they were on behalf
of God but actually they were their own god. I think the
present Christians should think that all wars due to
religion issues were all caused by people themselves
not God expect wars recorded in Bible)

So any opinion is actually based what you chose at the beginning. However, chosing to believe or not is somehow random.