Who recruits money mules? do the people who recruit money mules who steal money from bank accounts who are?

not in the united states ever really get caught? supposing that they are in africa, the former soviet union, ect....? why is it that a lot of times these people abroad are never really caught? the banks in the united states take the hit but why is it that these people are never really caught? does anyone know? is nigeria the most corrupt country in the world? rsvp. thank you.