Ki Theze: 

The first two words of the parsha , Ki Theizei sets the theme: When you go out... You are out to do something, to get somewhere. Then you  you chance upon something ...Something that is not planned,   an opportunity to fulfill a desire.  The circumstances arise  to benefit from another person or animal or thing that is weaker than you. How to you balance the opportunity against the ethics.  Where are the limits? 

The drama of the situation can magnify the desire.  The victorious soldier, who sees the attractive woman, is also the soldier who has survived the life threatening battle.  He realizes his mortality and wants to exploit every opportunity to enjoy life.  He sees the woman, who understands that her best chance of survival is to marry a conquering soldier, looking her best.  The Torah tells him to reconsider after she has shown more of her true self: removed her makeup, mourned her parents [who were killed by the soldier's friends in the war]. If he is still in love, he can marry her.  But the marriage is valid.  She cannot be reverted to spoils of war, to chattel.

 The confused son of his youthful passion cannot be relegated to a status lower than that afforded by his birth.  If he is the eldest, he receives the double portion, even though he no longer represents the ancestral values, and is a reminder that passion begets frenzy.  This sociopathic child could become a threat to society . Caution:  The lustful sin of opportunity can have terrible consequences.

The parsha is filled with guidance for the incidental.  The loss of a neighbor is an opportunity to return  the lost object, or care for it until she comes looking for it.  Be among those who help the fallen animal....

As individuals, we are instructed to be kind, to temper greed with compassion.  Leave wheat and grapes and olives for the poor to glean.  Taking a few grains as you pass through the neighbors field is not stealing... unless you bring a sickle and basket to collect. 

We hide behind the corporate to circumvent the humane.  Why shouldn't a drug costs $1000 per day? Someone ( probably an hourly worker) worked very hard to develop it.  Doesn't that justify the exorbitant profit of the speculator who bought the rights? She recognized an opportunity an married it.