What Explains the Power of Dzhokhar Tsarnaev’s Middle Finger?

The penalty phase of Dzhokhar Tsarnaev’s trial began Tuesdayin a federal courtroom in Boston. Already convicted of 30 felony counts relating to the 2013 bombing of the Boston Marathon, an attack thatkilled 3 people and maimeddozens more, the 21-year-old will now have thejury effectively decide whether he should spend the rest of his life in a maximum-security prison without the possibility of parole, or be executed. Federal prosecutors arevehemently arguing for the death penalty.

Paying even...