They have their liberty in Christ to interpret Scripture as seems right to them and the Holy Spirit --- or so they say. They are not under the Law, they owe no man anything but to Love One Another --- or so they say. And no man has authority over them --- or so they say.
What say?
True believers have the same Holy Spirit as the apostles did. As we can see in many religious organizations, and earthly over riding authority is no guard against error. The RCC included.
Acts 15:8 And God, who knows the heart, bore witness by granting them the holy Spirit just as he did us. 9 He made no distinction between us and them, for by faith he purified their hearts. 1 Corinthians 2:13 Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual. 14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned. 15 But he that is spiritual judgeth all things, yet he himself is judged of no man. 16 For who hath known the mind of the Lord, that he may instruct him? but we have the mind of Christ.
>>And how could one correct them?<<
Each autonomous assembly answers for themselves as we can see in Revleation.
>> On the basis of what? If you follow the link, you can see they are convinced they have Scripture on their side.<<
On the basis of scripture and it’s not an earthly organization that is responsible. It’s the local assembly as all instruction from the apostles show. Each was to control their own assembly.
Once again, an earthly over riding organization is no guarantee against error as evidenced by the RCC and most every organized religion I know of. Each of us is answerable to Christ on our own. Scripture is the only reliable source and those who God has called have been promised the indwelling of the Holy Spirit to teach what that person needs. If anyone thinks belonging to an organized religion is somehow a “safe haven” they are deluding themselves.
Has having the church interpret it for them done anything to change their behavior or convince them the church has it correct?
No, they do not have the liberty to interpret scripture as it seems right to them. They have a responsibility to God to honestly appraise the scriptures as they are written and follow the commandments God has given us. We don't fashion the scriptures to suit our desires. We conform to what is written.
If they do not approach the word with fear and trembling to do what is right in God's eyes, then I would suggest they're probably not even Christians in the first place.
Now, can you honestly say that the Church has never taken advantage of the scriptures for their own gain?