Wikileaks activities are calculated to harm the US and it's allies and damage the relationships.
Sun Tzu wrote in the Art of War that the best is to destroy the alliances of your enemy. The long term ramification is that people that might be sympathetic to America or our causes are going to think twice about entrusting our diplomatic overtures to remain secret. The person who handed those over is an excellent candidate for the first person to be convicted of treason under the constitution.
If Wikileaks is attacking Sarah Palin, then, much like DU, they think she is the greatest threat to them achieving their ends.
A person, and for that matter a country, is often best judged by their enemies. Sarah and the United States stack up favorably. The rapist and his friends, not so much.