It would have been harder to support Ukraine if they went and killed thousands of innocent Russian before being aggressed by Russia. But they didn’t.
Most of the west do support the right for Israel to defend itself from such attack, but there is no doubt that Israel went way to far with their riposte. No matter if the Hamas uses the Palestinian as meat shield, Israel made so many “mistakes” and killed so many innocents that it should have asked long ago for the UN to intervene in their place to avoid further unnecessarily killing.