There is evidence that a not insignificant number of Israelis (European settlers) participating in the frequent state sponsored massacres of the indigenous Palestinian population are sadistic. E.g., The Israeli snipers wearing t-shirts during the Cast Lead massacre of Gaza civilians which pictured a pregnant women in the cross hairs of a rifle with the caption, "One shot two kills".
No. Israel is not unique in the horrors it inflicts upon innocent people. But, it is unique both in the recency of their colonialist project (the Palestinian's land was stolen from them, by the European settlers, within the lifetimes of some Palestinians), and in how Israel has weaponized historical European massacres of Jews to deflect criticism of its horrific practices. People should not give this a free pass.
It is not anti-Semitic to criticize, the state of Israel, the actions of its soldiers, its apartheid laws which grant rights to Jewish citizens that are not extended to non-jews (even the minority of Palestinians who did not flee their homes when the Jews forcibly were taking homes at gunpoint, and so are now considered Israeli citizens do not get the same rights as Jewish Israeli citizens), their extreme far-right government with theocratic influence which periodically engages in massacres of civilians, their racist Knesset (parliament) members who e.g., threatened one of the very few Palestinian-Israeli representatives with rape and murder for opposing their sadistic illegal (per international law) group punishment of Palestinian civilians. Remember when Netanyahu said, he was going to, "put the Palestinians on a diet"? This was a euphemism for Israel was going to starve them, since Israel controlls all borders into their open air prison-- sadistic?
Historically being horribly oppressed does not excuse horrible violent oppression of a population that had nothing to do with your own oppression. It would be like the Apache rounding up, at gunpoint, the Belgians into concentration camps, and settling into their former homes. Then, periodically engaging in massacres of unarmed Belgian civilians confined in the camps-- all the while referring to the historic massacres by the United States of Apache as an excuse for their violence against the Belgians (Yes, if it were Congolese, and not the Apache, they would have every justification to retaliate violently against Belgium, just as if world Jewry decided to retaliate against Germany, there would be justification, but to attack an innocent third party is simply not justifiable).
Only 10% of Israelis did not support Cast Lead, in a poll by Haaretz (an Israeli newspaper). So, sadly, it appears the massacres have the support of the vast majority of the settler population in spite of general knowledge of civilian (including child) casualties before the poll. Some might consider this sadistic too.
https://imeu.org/article/operation-cast-lead
https://www.deviantart.com/restorative/art/Israeli-Fashion-1...
https://www.haaretz.com/2009-01-15/ty-article/poll-shows-mos...