I don't know that anyone celebrates civilian casualties regardless of their culpability.
Israel is not above valid criticism for avoidable casualties, but it's rather like the sweltering hate for Trump; they justify any smear, any abrogation of his rights because...well, Hitler...or something. Most criticisms of Israel are a direct result of them 1.) being Jews and 2.) setting such a high standard of warfare conduct for themselves that are historically singular, but mostly 3.) a propagandized history of the region that afflicts perhaps 95% of the people who authoritatively talk about it. It is literally more a propaganda war for longterm survival than an armed conflict.
Feed and supply the populace who elected the government who has repeatedly waged attacks, knowing you're directly sustaining that enemy military? Taking extraordinary measures to warn and avoid civilians whom that enemy government shields themselves with? Who does that and with such a tiny population in a tiny country surrounded by enemy?
I can find some criticisms with the question of settlements for example, but these are lands captured from enemy combatants and held strategically by Israel now. Again, Israel has set a higher bar for themselves than history or right to defense demands - don't gamble land you can't afford to lose.
I can't find criticism for this campaign.
