Incompetent? No.

From Wikipedia:

In July 1995, Netanyahu led a mock funeral procession featuring a coffin and hangman's noose at an anti-Rabin rally where protesters chanted, "Death to Rabin". The chief of internal security, Carmi Gillon, then alerted Netanyahu of a plot on Rabin's life and asked him to moderate the protests' rhetoric, which Netanyahu declined to do. Netanyahu denied any intention to incite violence.

Rabin was leading the Oslo peace process. Four months later in November of 1995, he was assassinated. Netanyahu's corruption, power grabs, and violence are intentional and planned.

Why would they have wanted to stop it. 150 martyrs is a small price to pay for carte blanche to exterminate a people.

Israel had snipers around the festival. We’ve all seen the videos of Israeli forces killing their own citizens during the attack.

Even if he is incompetent, he's still Prime Minister of Israel. It's dangerous to disregard people's opinions just because you think that person is an idiot, especially if they're in a position of power.

That's the nature of power. People have to pay attention to you even if your opinions are bad.