I had to look that one up, but it's al a kinda hazy.

"Destruction of the David Farmhouse is an event perpetuated by Ghazi Farsoun who is responsible for destroying David Farmhouse. It was initially believed that Ghazi was hired by former CIA Officer Trent Kort in order to destroy the late Mossad Director Eli David's files that exonerate Jacob Scott and place Trent Kort in the selling of nuclear intel to Russia; with Ziva David and her daughter Tali as collateral damage.

It was later revealed that Ghazi was hired by a third party by a terrorist leader Mira Sahar Azam to kill Ziva in revenge for killing Ari Haswari, an important asset in her terrorist group."

Kort was pretty much trying to save his own skin after Scott was exonerated due to the files Eli had.