NAIROBI, KENYA — Human Rights Watch has found that African governments continue to crack down and wrongly arrest political opponents, critics, activists and journalists. The rights group also says armed forces and armed groups in some African countries have targeted civilians, killing them and driving them from their homes. The conflicts in Sudan and Ethiopia feature prominently in a Human Rights Watch report released Thursday. The report says that in Sudan, the war between the armed forces and the rebel Rapid Support Forces has displaced 12 million people, destroyed infrastructure and blocked humanitarian assistance. In Ethiopia, rights group investigators found