Dirar Abu Sisi, who runs the only energy facility in Gaza, was kidnapped on a train from Kiev by the Mossad or Shin Bet. His wife is Ukrainian and he has a very large and young family of toddlers.
The Fogel family murder was a grave evil, but kidnapping a father with many young toddlers is almost as evil. Perhaps the Israelis are upset that he converted the energy plant, so it would be dependent on Egypt, not Israel.
St Augustine like proportional responses is utterly lacking in the Levant.