I agree. It wasn’t. The problem is these people had no idea of how things work or are governed in the spiritual realm. They also are unable to hear Gods still small or speaking louder voice. They just thought whatever they think is right Obviously that was not the case.
If we look at Jesus’ exorcism, we see he knew what he was doing. They don’t.
While I agree Jesus knew what He was doing, Jesus didn't do exorcisms. They are rites with incantations. Jesus commanded evil spirits with a word, and they came out. That's not an exorcism. The Jews of Jesus' day recognized the difference immediately:
Then they were all amazed and spoke among themselves, saying, "What a word this is! For with authority and power He commands the unclean spirits, and they come out." (Lk. 4:36 NKJ)
Exorcisms are not Christian. Never does the Bible command we do exorcisms. The apostles were granted Jesus' authority to command Demons come out, they didn't exorcise them out:
17 Then the seventy returned with joy, saying, "Lord, even the demons are subject to us in Your name."
18 And He said to them, "I saw Satan fall like lightning from heaven.
19 "Behold, I give you the authority to trample on serpents and scorpions, and over all the power of the enemy, and nothing shall by any means hurt you.
20 "Nevertheless do not rejoice in this, that the spirits are subject to you, but rather rejoice because your names are written in heaven."
(Lk. 10:17-20 NKJ)
Only those Jesus who walked with Jesus and were appointed by Him received this "sign of those who believe":
17 "And these signs will follow those who believe: In My name they will cast out demons; they will speak with new tongues;
18 "they will take up serpents; and if they drink anything deadly, it will by no means hurt them; they will lay hands on the sick, and they will recover."
19 So then, after the Lord had spoken to them, He was received up into heaven, and sat down at the right hand of God.
20 And they went out and preached everywhere, the Lord working with them and confirming the word through the accompanying signs. Amen. (Mk. 16:17-20 NKJ)
That special authority to cast out demons doesn't exist today. Notice the writer of Hebrews speaks of those special signs and wonders that authenticated the Word of God before the Bible was fully written, in the past tense:
3 how shall we escape if we neglect so great a salvation, which at the first began to be spoken by the Lord, and was confirmed to us by those who heard Him,
4 God also bearing witness both with signs and wonders, with various miracles, and gifts of the Holy Spirit, according to His own will? (Heb. 2:3-4 NKJ)
The only way a demon can be driven out of a possessed person today, is for the sinner to repent and believe in Jesus. The Holy Spirit will drive it out as He enters the life of the believer.
You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world. (1 Jn. 4:4 NKJ)
We don't need signs authenticating the Bible, that was already fully accomplished by the apostles.