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I don't think so just like genocide in current newsprint can't be justified today.

There is actually a wonderful YouTube video by DarkMatter2525 about this very question. It is an animation about a pastor in a church and a man who appears claiming to be a time traveler. I don't want to spoil it for you so I am providing the link. It is a great story narrative with several twists that helps answer the question in an entertaining way.