Vayigash: approach and avoidance

Warning::  I am reading Freud. 

 A major theme in Freud's work seems to be ambivalence.  Many emotions contains  their opposites. This parsha strongly reflects that.  There is no doubt that Yehuda is ambivalent when he approaches Joseph to offer himself as a slave in exchange for his half-brother  Benjamin.  I can feel his trepidation, going before Viceroy of Egypt and his doubts  about fulfilling his costly promise to his father, rescuing another favored son at the cost of his own life.

 The name of the parsha,its first word, Vayigash ( Oh my gosh!) is the essence of ambivalence.  To approach is come closer, but not to arrive, not to conclude.Avoidance is implicit in approach. 

Jacob's descent, with his clan, to Egypt was hard for him.  He wanted to stay in the Promised Land, as his father, Isaac had done.  Although Jacob had already left to escape Esau's wrath ( at the instruction of his mother), he had hope to merit dwelling in the land until his death, like his father had.  He was also afraid of participating in the fulfillment of the prophecy given to Avraham at the Brith  between the parts ( Bereshith

15:13) :

יג  וַיֹּאמֶר לְאַבְרָם, יָדֹעַ תֵּדַע כִּי-גֵר יִהְיֶה זַרְעֲךָ בְּאֶרֶץ לֹא לָהֶם, וַעֲבָדוּם, וְעִנּוּ אֹתָם--אַרְבַּע מֵאוֹת, שָׁנָה.	13 And He said unto Abram: 'Know of a surety that thy seed shall be a stranger in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years;

Perhaps Yaakov thought that the opressing nation was Esau, and so he avoided going to Seir.  But Jacob and his family were forced to go to Egypt, and fooled into stayng there willingly.

Notice where the Israelites went: Goshen, the same root as Vayigash, (The nun makes the word an  abstract noun denoting quality and state .) The state of approach, the state of ambivalence. 

What is the use of ambivalence in the context of fate?