Because international institutions have an anti-Israel bias. E.g. in 2020 Israel was condemned by the UN 17 times while all the other countries put together only got 6 condemnations. [1]

In 2020, Israel killed 33 Palestinians. Compare that to Americans killing 19444 Afganis, drug lords killing 34512 Mexicans, Saudis killing 19056 Yemenis, Boko Haram killing 7300 Africans, etc. [2]

[1]: https://www.aljazeera.com/news/2020/12/24/un-condemns-israel...

[2]: https://en.wikipedia.org/wiki/List_of_armed_conflicts_in_202...