Mark 9
17 And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit;
18 And wheresoever he taketh him, he teareth him: and he foameth, and gnasheth with his teeth, and pineth away: and I spake to thy disciples that they should cast him out; and they could not.
19 He answereth him, and saith, O faithless generation, how long shall I be with you? how long shall I suffer you? bring him unto me.
20 And they brought him unto him: and when he saw him, straightway the spirit tare him; and he fell on the ground, and wallowed foaming.
21 And he asked his father, How long is it ago since this came unto him? And he said, Of a child.
22 And ofttimes it hath cast him into the fire, and into the waters, to destroy him: but if thou canst do any thing, have compassion on us, and help us.
Spirits do destroy
But, you are correct...in this passage the thief is man
I would also say however, that evil spirits work through man
Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world. 1 John 4:1
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; 1 Timothy 4:1
Revelation 16:
13 And I saw three unclean spirits like frogs come out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet.
14 For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty
