You may have noticed that former President Jimmy Carter, well-known for his outspoken criticism and defamation of Israel, has apologized for any damage he may have done to Israel's image (such as, for example, the impact of his 2007 book accusing Israel of apartheid).
Forgiveness is a virtue, but probably more of a virtue when the repentance is sincere. The element of doubt here is Carter's timing. Turns out his grandson Jason is running for a Georgia state senate seat in a district with a small Jewish population that is politically significant.
Perhaps the best way to judge Carter's sincerity is, as Jacob Laksin suggests, to see if he moderates his love affair with Hamas.