> some fighting eventually with a few fighters holed in in Rafah
Can you please remind me where they finally found Yahya Sinwar? And was that before or after they "level[ed] the city"? Do you think they would have found him if they left the city untouched? Why was he there in the first place?
> And Israelis continue leveling entire areas the whole year after so called "ceasefire" during which there were almost no attacks on them
Hamas isn't following a ceasefire; they've been militarily degraded.
There's a causal relationship here: If the IDF hadn't destroyed so many fighting positions and booby-trapped buildings, there would have been many, many more attacks and IDF soldiers KIA.
You say "there's no justification" but unwittingly go on to point out exactly why it's justified.