The Little Things 2.0

Archer:  Comander Shepard.  I've heard of you.  Another Cerberus defector, as it were.
Shepard:  Something like that.
Archer:  Dr. Gavin Archer.  I imagine we both crossed the Illusive Man in our own way.
Shepard (selecting - Why did you come here?):  How did you end up here?
Archer:  The research I did for Cerberus hurt a lot of people.  I've done things no human should do.  There I was.  With blood on my hands.  Blood I could never wash away.  The Illusive Man didn't care.  He said our goal was greater than any sacrifice it took to attain it.
Shepard (selecting - So you ran?):  I take it the Illusive Man didn't just let you resign.
Dr. Archer:  For a man who loves to lecture about morality's shades of gray, he's very black and white when it comes to obedience.  Either you do the job - or you die trying to quit.
Shepard (selecting - Your work for Cerberus.):  What kind of work did you do for Cerberus?
Archer:  It was called Project Overlord.  An experiment attempting to find nonviolent methods for controlling the geth.
Shepard:  That actually doesn't sound like a bad idea.
Archer:  Yes.  Well, like most things the Illusive Man touches, my work became corrupted by degrees.  Suffice it to say, things didn't end well. 
Shepard (selecting - What happened?):  How did it go wrong?
Archer:  Serendipity, I'm afraid.  The geth were unresponsive to my attempts to communicate with them.  Until my younger brother David made a breakthrough.  He was an autistic savant.  A mathematical genius.  In no time, he had mastered geth language and was communicating with them.
Garrus:  You mean he could speak directly with the geth?
Archer:  It was rudimentary at first, so I decided to take the next step: tap David straight into their network.  It was sensory overload.  No mind - even a savant's - could process the barrage of information.  It drove him insane.
Shepard (selecting - Did he have a choice?):  Did David volunteer for this?
Archer:  The Illusive Man kept pushing for results.  I was eager to please him.  It seemed... harmless at first.
Liara:  You forced your own brother to do this?
Dr. Archer:  Believe me, it's a nightmare I re-live every night.  He went berserk - his mind became a computer virus that infected all our systems.  He killed dozens of lab personnel... we finally had to detonate nuclear weapons over the base to stop the havoc.
Shepard:  That's all, Doctor.
Archer:  I appreciate your help getting us out of here, Commander.