And that goes back to God's Holy Spirit not doing it's job in the first place and God allowing this to happen.
It's all there in the Bible. God's Holy Spirit does His job through scripture. Unfortunately, many Christians don't read it. Even Paul commended those Christians who daily searched the Old Testament to test Paul's massage and made sure that Paul wasn't making stuff up. Christians should not put preachers on a pedestal. A preacher can preach the word of God and do much good, as long as he sticks to the truth, whether he is a Christian or not. If he sins and misleads people, that's between him and God. If people put him on a pedestal, then that's between them and God.