From Strategy Page:
March 19, 2009: Israeli negotiations to free Palestinian terrorists from prison, in exchange for an Israeli soldier (Gilad Shalit) seized on the Gaza border three years ago, revealed that 65 percent of terrorists freed in earlier exchanges subsequently returned to terrorist activities. Under these circumstances, it is more difficult for Israel to release Palestinians. This, despite the fact that the released prisoners are supposed to promise to no longer engage in terrorist activities, or go into exile.
The recidivism numbers came from an Israeli study of past exchanges. In 2004, Israel released 436 prisoners in exchange for a kidnapped Israeli civilian, and in 1982 1,150 were released for three Israeli soldiers.
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My Comment: If one releases 100 men for a prisoner exchange, what is the point when 65 of them will be going back to the fight.
I would never agree to such an arrangement.