Zack Snyder is wrong.
Since Batman is a completely fictional character and his world is a construct created by a writer who is trying to present Batman as a hero, there is no reason to present murder as a heroic act. Batman doesn't kill. He finds another way. 

https://twitter.com/JackPosobiec/status/1110510500771696640 …
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For all the flack BvS and JL got, they did bet the most *fluid* Batman ever on screen. The rest are all stiff and armored. Affleck’s actually did acro-BAT-ice and swinging from buildings.
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