You're absolutely right.
I'm old enough to have been in college in the aftermath of 9-11 and the build up to the second US-Iraq war and distinctly remember that nothing was able to still the beating of the war drums - not journalists calling out the "dodgy dossier" from UK intelligence that supposedly provided proof of WMDs, not a million anti-war protesters marching in the streets against the US/UK contravening the UN to invade Iraq. The government went ahead anyway, backed by a significant proportion of the media.
The feeling of futility with the current situation in Gaza is all too familiar.
They're right, though. The proposed resolution put a ceasefire wholly contingent on Hamas giving up their only bargaining chip (hostages) instead of outright calling for an immediate ceasefire.
Had it passed, Hamas would have simply ignored it and Israel would have felt justified in continuing its murderous ethnic cleansing campaign.