Soo... I mean... Can anything go wrong when you take people extremely well trained in covert action, with a lot of know-how about how US and allied intelligence

Soo... I mean... Can anything go wrong when you take people extremely well trained in covert action, with a lot of know-how about how US and allied intelligence agencies work, and take their income away after 8 months? Would they take money for doing much the same job but for another employer, less fullt aligned to America's interests? I'm sure most of them would never dream of it, but there may be the odd one with a sick child and a desperate need for money.