The UN does not supply arms to Israel. The UN has passed many resolutions condemning Israel’s treatment of the Palestinians, going back decades. They have literally already done everything the UN can do, many times over. They weren’t a governing body with binding powers over where the US sends arms, or who France chooses to support.
So I’d have to say that your comment is less effective than their walkout, because it isn’t even properly informed.
“aka scientists?”
Not sure what that means.