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Because if you are a Christian, then you should live by the New Testament only.
Not by Old Testament with its early tribal and bloody rituals.
Not by some puritan theologians with the spirituality of an accounting clerk.
You should live by the teaching of Christ.
And it's quite simple really. It's not your job as a Christian to obsessively lurk into other people's lives to find sin. It's between them and the God, not you.
Your job is to be Christian to them.