Good question.

Answer - the aim is to spread dar al-Islam as much as possible - nowhere is off limits; hatred of Jews is fundamentally enshrined in their thinking anyhow; the success of the Israelis in making the desert 'bloom' is a reminder of their own inability to advance technologically, scientifically and economically - thus it all must be a 'conspiracy' since their own lack of development cannot be explained in any other way - (compare the number of books published and patents granted between Israel and the entire surrounding Middle East)

Even if Israel did not exist, the Arabs would need to invent something like it to blame their own failures on.

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"let's slip out of these wet clothes and into a dry martini" Mae West