This last sentence explains why a Christian would not take anyones life because they are deemed heretics whatever they felt God’s judgement to be upon them.
Everything Christ taught tells me we don’t have the right, the authorization or the knowledge to do so and no human can give such to another.
There's a world of difference between expelling the immoral brother and killing someone who doesn't believe as you do. The difference is hardly subtle but still, it manages to escape some.
I also notice that as of yet we still have not been provided with Scripture supporting the murder of those anyone else deems to be heretic.
1 Samuel 16:7 But the LORD said to Samuel, "Do not look on his appearance or on the height of his stature, because I have rejected him. For the LORD sees not as man sees: man looks on the outward appearance, but the LORD looks on the heart."
One further question: are you against the death penalty?