Syrian Sunni Islamic Extremists fought & killed Americans in Iraq and now America is supporting the same people - what gives?

Nancy Pelosi’s visit to Syria was the latest challenge to the White House by congressional Democrats, who are taking a more assertive role in influencing policy in the Middle East and the Iraq war.

Bush voices criticism
Bush has said Pelosi’s trip signals that the Assad government is part of the international mainstream when it is not. The United States says Syria allows Iraqi Sunni insurgents to operate from its territory, backs the Hezbollah and Hamas militant groups and is trying to destabilize the Lebanese government. Syria denies the allegations.

http://www.nbcnews.com/id/17920536/ns/world_news-mideast_n_africa/t/pelosi-shrugs-bushs-criticism-meets-assad/#.UibTJzY3t5G