I would imagine Israel gets credible intelligence of attacks pretty much everyday. It is easy to retrofit evidence to fit a narrative.
That is not to say it is not possible of course, but when I see a history of Israel launching attacks on Gaza, annexing of land etc, they have regularly shown they don't need a false flag to attack, so why would they need one now?
All good points, but the failings are seismic, which brings into question how neither of Aman, Shin'bet or Mossad picked up on the extensive training and build-up.
Of course, it's all speculation at the moment, however it's believed Egypt warned Israel. Then you consider the number of rockets stockpiled for the offensive.
Add to that, the resources needed for the ground and air attack, including the training camps beforehand. With Israeli infiltration in Gaza, how was this not seen?
How did other western agencies not know? If they didn't know, well you've got to give begrudging credit to Hamas for organising an operation so secretively.
But I can't help but think, as I mentioned earlier, that Israel may have known more than first thought - perhaps not the extent of the attack, but something.
This is their casus belli - this is their opportunity to go the extra mile. Again, let's be careful with assumptions, but I've heard there's 30+ brigades prepared.
That is a minimum three times the number called up during the last Israeli-Gaza conflict, so perhaps the scale of the Hamas attack allows such an offensive.
Yet let's not forget, that the actions from both sides of this conflict is going to have a dire and catastrophic on innocent civilians.