Like every Christian group, Nicolaitans include some people who have never been genuinely born again. These tares, when they bear fruit, will sometimes use their leadership positions to turn Christians away from the Word of God.
In the middle part of the twentieth century, unsaved men gained leadership positions in the Southern Baptist Convention. Preaching strongly that they needed to have unity, they urged genuine Christians to compromise and accept their sins.
Fortunately, genuine Christians within the Convention fought back and regained control, but some other denominations have not been so fortunate.
But Christian Nicolaitans have another unusual situation. While other Christians have their faults, God wants the church to correct their problems. But in Revelation 2, God says "15 "Thus you also have those who hold the doctrine of the Nicolaitans, which thing I hate. 16 Repent, or else I will come to you quickly and will fight against them with the sword of My mouth."
Folks, this is a mean thing to say, but it sounds like tolerating Nicolaitans in the church is wrong, and God wants us to expel them.