I agree your last sentence, but not the first.
The bombs were HE and incendiary, not anti-personnel.
The people received enough warning to take shelter in plenty of time.
The effects of the fire storm were not predicted.

Of course it was a human catastrophe and people died in thousands, but the aim was destruction not death

The aim of Hamas bombs is death not destruction, or they would be just HE without the nails and ball-bearings.
They are launched only to kill and terrorise Jews, in furtherance of they covenant to kill Jews everywhere.

You are in denial about Hamas.
You make excuses.
They do not mean what they say.
Yes they do, and their actions bear it out.