What Do You Buy the Children of the Terrorist Who Tried to Kill Your Wife?

David Harris-Gershon and his wife, Jamie, moved to Jerusalem full of hope. Then, mere days after Israel thwarted historic cease-fire negotiations among the Palestinians, a bomb ripped open Hebrew University’s cafeteria. Jamie’s body was sliced with shrapnel; the friends sitting next to her were killed.

When a doctor handed David some of the shrapnel removed from Jamie’s body, he could not accept t...