Paris Hilton slammed abusive child welfare programs and vowed to “not stop until all youth are safe” during a surprise appearance on Capitol Hill, RadarOnline.com can report. The hotel heiress testified before Congress on Wednesday about the modernization of the nation’s foster care system. While Hilton, 43, advocated for the modernization of child welfare programs, she also discussed her own history and experiences within the system, which date back to when she was a teenager. “When I was 16 years old, I was ripped from my bed in the middle of the night and transported across state lines to t…