From Wikipedia:

Based on the findings of the Dotan and police investigations, Israel’s attorney general Elyakim Rubinstein brought criminal charges against Eyal, Mishori, Karagula, Ben-Ezra, and Bar-Ilan for causing death by negligence and for building without proper permits. On March 15, 1998 in Tel Aviv Magistrate Court all five pleaded not guilty. Final arguments in the trial were presented in October 1999.
On the 17th of April 2000, the three-judge panel of the court found all five defendants guilty of causing death by negligence. The defendants were sentenced on the 5th of June, 2000. Bar-Ilan was sentenced to one year and nine months in prison, plus a suspended sentence of 21 months. Ben-Ezra and Kargula were given 15-months in prison, plus suspended sentences of two years. Mishori served nine months in prison, plus a suspended sentence of 15 months. Eyal was sentenced to six months’ community service.

That was the value of lives of 4 Australian Jews and the health of many others. 15 to 21 months in jail, or 6 months community service.

Remember that when the Israelis ask you do donate your hard-earned money.

Spot on Ron Burdo.

Has anyone responsible for this incompetence been arrested and gaoled?

It was not an accident, it was criminal negligence.