I doubt the Israeli government gave any thought to the overall cost of that invasion
The invasion of Gaza was not arranged by Israel.
It was entirely done by the UK.
The British have literal full control over Israeli security establishment.
Mossad is a sub branch of mi6. The only thing Israeli about it is that a lot of its employees are Israeli.
Feebleminded ones at that.
You have to wonder if the Brits get a tax advantage for hiring the handicapped.
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An important thing for casual observers to note///
The UK gets a strategic benefit which will be proportional to the level of destruction.
The more Israelis die in the final stage...the bigger Arab and Muslim catharsis...the bigger strategic edge the Brits get.
The Russians have a different calculus and do not benefit from a high body count.