They mostly keep them indoctrinated for Jihad. https://palwatch.org/page/8418
If Israel's mission was to kill all of them that would have already been done.
IDF safely rescues 2 hostages from Rafah in daring nighttime operation
IDF safely rescues 2 hostages from Rafah in special nighttime operation
IDF safely rescues 2 hostages from Rafah in special nighttime operation
Explanation of delayed audio processing in ADHD