Atz Hadaas, Amalek And Weights

Rashi in the beginning of Parshas Zachor explains the juxtaposition of Amalek right after the parsha of weights זכור את אשר עשהא עמלק וגו׳ – אם שקרת במדות הללו ובמשקלות, הוי דואג מן גירויב האויב, שנאמר: מאזני מרמה תועבת י״י (משלי י״א:א׳), וכת׳ בתריה: בא זדון ויבא קלון (משלי י״א:ב׳).  Why does cheating in weights lead to Amalek; what is the connection?  The Gemorah Chullin (139b) says the hint to Haman in the Torah is in the word Berashis (3:11) המן העץ אשר צויתיך לבלתי אכל ממנו אכלת.  Why is Haman connected to the these words?
Why was eating from the עץ הדעת prohibited; seemingly knowing between good and bad should be a good thing?  Knowledge of the difference between good and evil is indeed a positive; but one has to be an honest judge between the two.  Before the sin of the עץ הדעת, Adam and Chava also had a clear perception of good and evil but they had no personal bias and connection to it.  They were able to judge between the two forces as outsiders and to separate between the two.  The word דעת means connection.  Eating from the עץ הדעת meant that know Adam and Chava became connected to the good and the evil.  They could no longer be bystanders to arbitrate fairly between the two but they had to see the ideas through their own prism.  They decided good and evil not based upon what it is inherently but based upon how they felt, how it affected them, was it good or bad for them. 
The idea of false measures isn't just in the scales in your fruit store, its a message for life.  How does a person weigh what's important or inconsequential, what's good or inappropriate, moral or depraved?  These are the scales of life.  If one's scales are weighed down by their own feelings and ego, that is having false scales and measurements.         
This is Amalek.  They attack the bridge between the מוחין and מדות of the individual as is represented by the וה of the שם that they cut off.  That bridge is דעת.  Amalek infiltrates the דעת of a person to be מקלקל the חשבונות of an individual.  That is why Haman is hinted to in the עץ הדעת for that is the source of his power.