Is this our new responsibility?

Conor Friedersdorf, an associate editor at The Atlantic, where he writes about politics and national affairs, writes:
For most people in the United States, Canada, and Western Europe, self-defense needn't be a daily preoccupation. It is rare that someone is murdered by a stranger. Insured against robbery, banks instruct their tellers to hand over cash if they get so much as a threatening note. On