It’s called Realpolitik - weaken Israel, and strategically, the Middle East looks very differently. A resurgent Iran would see increased terrorism in the region, and Israel is understandably unwilling to provide Hamas and Hezbollah with a platform for further attacks. The poor civilians are collateral in a war started by Iran and its proxies.
Meanwhile , China is facilitating Russia’s war against Ukraine, India is funding Russia’s war effort, and North Korea is supplying troops.