Why are the Pastors reluctant to reveal to their congregation who the Wolves are?

Another local evangelist and I have been considering this “Why are the Pastors reluctant to reveal to their congregation who the wolves are”. Perhaps you can give us insight into this phenomenon.
Throughout the bible we are warned to separate ourselves from sinners, (note separate not isolate). The idea of separation begin with Israel and flows into the new testament church. Paul speak of separation  in 1Cor 6:14-17.
 2Co 6:14 Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness?
 2Co 6:15 And what accord has Christ with Belial? Or what part has a believer with an unbeliever?
 2Co 6:16 And what agreement has the temple of God with idols? For you are the temple of the living God. As God has said: "I will dwell in them And walk among them. I will be their God, And they shall be My people."
 2Co 6:17 Therefore "Come out from among them And be separate, says the Lord. Do not touch what is unclean, And I will receive you."

He speaks of separation in Ephesians;
Eph 5:6 Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience.
 Eph 5:7 Therefore do not be partakers with them.
 Eph 5:8 For you were once darkness, but now you are light in the Lord. Walk as children of light
 Eph 5:9 (for the fruit of the Spirit is in all goodness, righteousness, and truth),
 Eph 5:10 finding out what is acceptable to the Lord.
 Eph 5:11 And have no fellowship with the unfruitful works of darkness, but rather expose them.
 Eph 5:12 For it is shameful even to speak of those things which are done by them in secret.

The bible even commands us to mark, note, be on guard, or keep an eye out for those who teach contrary doctrine.
Ro 16:17 ¶ Now I urge you, brethren, note those who cause divisions and offenses, contrary to the doctrine which you learned, and avoid them.
 Ro 16:18 For those who are such do not serve our Lord Jesus Christ, but their own belly, and by smooth words and flattering speech deceive the hearts of the simple.

2 John continues the warning
2Jo 1:10 ¶ If anyone comes to you and does not bring this doctrine, do not receive him into your house nor greet him;
 2Jo 1:11 for he who greets him shares in his evil deeds.

Our Pastors have become reluctant to reveal the wolves who teach contrary doctrine and devour the sheep. Others have gone further and greeted them by giving recognition from the pulpit. Still others have invited them into their church to dine directly on the sheep.

The question still is why? Why in spite of all the biblical warnings and guidelines? Why? Can you tell me Why?