Ezekiel 18:4 doesn't say to kill. It says they'll die, but that's more in an existential afterlife sense.

Edit: Also, God does the killing in 1 Samuel 6:19–20.

This feels like a bit of a Gish gallop. The Bible "commanding us" to kill someone and God killing someone are two very different things within the Bible. (Which the Bible already commands us to kill enough people that I don't know why the list decided to use flimsy examples like this.)