Why did Jesus allow Judas to join his apostles?

This question embodies an understatement of the role Jesus played in the formation of the Twelve. Jesus did not just allow them to join; Jesus chose them, each and every one.

Judas was the one that was lost, as in, “the son of man is come to save that which was lost,”

as in, “if a man have an hundred sheep, and one of them be gone astray.”

Now this question becomes akin to this one: “Why does your master eat with publicans and sinners?

Fortunately, Jesus answered that question explicitly. Else, we would have people calling themselves Christians saying, “Jesus would never have eaten with publicans and sinners.”

Unfortunately, Jesus did not say explicitly why he washed the one who was not clean, the foot of the one whose heel was lifted up against him.

Also, Jesus did not say explicitly that a washing by him would cast out of the prince of this world.

Jesus did say that the hand of Judas was with him on the table, that Judas was dipping with him in the same dish, but he did not say explicitly that Judas was cooperating with him.

Now the words of Jesus have been changed from “who delivers me,” to “who betrays me." Now his explicit statement of truth has been twisted into a lie, and the lie dominates the world.

Although Jesus identified as satanic, an attitude of opposition to those things of God which he said must happen at Jerusalem, he did not say explicitly that that would be the influence of Satan upon Judas when he entered into him after the sop.

He did say explicitly, immediately after Judas went out, “Now is the son of man glorified.” But how many understand that one glorifies another when he does the will of the other, not his own.

Jesus chose Judas to be with him that he might raise him up again at the last day, and the fact that Judas glorified Jesus at the last day is evidence that Jesus accomplished his mission.

Or, if you must, that is why Jesus allowed Judas to join his apostles.