What is D?

[GirlProgrammer]

D is an exercise in futility.
D is melanoma.
D is melodrama.
D is a waste of time and effort.
D is vindication for Tom Pretty and the Hearttakers.
D is a crime against humanity.
D is the cause of cancer.
D is a cult.
D is a monument to stupidity.
D is bad.
D is college.
D is snakeoil.
D is "the devil".
D is one of the world's most costly research projects.
D is un/dis-managed.
D is the cause of crop loss globally but mostly because it is directlly 
the cause of global warming.
D is masturbation.
D is what you get when a back-end compiler developer goes into hair 
design.
D is a charitable fund for Walter Bright.
D is "Viet Nam".
D is a reason to cry.
D is a result.
D is C++ gone bad.
D is handprints in kindergarten and so should be recognized as above any 
presidency.
D is rebellion.
D is afraid.
D is uknowing.
D is hiding your head in the sand.
D is "touche!".
D is perpetual adolescence.
D is "the living dead".
D is pathetic.
D is a cashcow.
D is a bad grade in school.
D is a book.
D wants to die but can't.
D is all of the above.

What is D?