OK here are the reasons why Pakistani passport is not required for Israel.Whenever you hold a Pakistani passport here is a message on the passport.
The reason here is that Pakistan is a part of the Arab League on the boycott of Israel but still Pakistanis can visit Israel on other passports which have visa free access to Israel.Here is a map of all those nations which cancelled Israeli passport holders.
On the blue it is Israel
Light green is all those nation which reject Israeli passports but if you hold other passport you get the opportunity to visit Israel.
Dark green represents that any person holding Israeli stamps cannot visit those countries, even holding other passport.