italy offensive power is dramatically higher than israeli. offensively the difference is 30-40 points. il defens will reduce impact but no defense could have chances if not supported by strong offensive scorer and shooters. ita+20
just +10 would be a success for il
Italy is averaging 11.8 ppg more. Why should then the difference be 30-40 points?!

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You are great in inventing things. You cannot just take any single Italian player and say that he can score 20 points in the game. There is just one ball and 40 minutes to play in a regular game. Not enough shots for everybody to score this amount of points.
BTW, statistically, Israel concedes 74.5 ppg, while Italy gives up 86.8 ppg. That's a difference of 12.3 ppg. More than Italy is gaining on offense. And we have to consider that Israel has basically tanked one game. What's also interesting, Italy has scored exactly the same number of points they have conceded.
Stats can bring you so far
As it was mentioned, so far, Italy was unable to put anyone away. They've had opponents with different styles. Slow basketball, fast basketball, tall centers, shooters... a great offensive display but not more. Being #16 in rebounding in this championship, despite having tall, mobile and athletic guys on the roster, while taking a ton of shots, is absolutely not good.
Still, Italy is the favourite. Maybe, simple for the reason that Israel is not a tough as nails group on defense as it used to be before and rather has smooth scorers. Also, Israel is shooting much less from the outside than it used to do before. It does so very effectively (40%) but not enough in numbers to spread the floor well.
But... the beauty of basketball is that the game is over, when the final whistle has sounded.
By the way, a -10 is not a success in knock-out stage. It means that you are out. Either you win (success) or you lose (no success). It's not like Israel is playing Team USA and is sure to be out, while the margin counts for self-respect.