By Humeyra Pamuk and Patricia Zengerle WASHINGTON (Reuters) – Thursday’s release of U.S. basketball star Brittney Griner in exchange for a convicted Russian arms dealer has resurfaced an old question: Do prisoner swaps do more harm than good? Amid the celebrations following Griner’s return some critics, including members of Congress and federal law enforcement, argued such trades only encourage foreign states to target Americans to gain leverage over the United States. Families of those detained abroad reject that argument, saying there is no hard evidence to support that and that the U.S. gov…