There are obvious parallels between that UN vote on Zimbabwe and the final UN vote on Iraq.
In both cases there was;
1. a tyrant brutally oppressing his own people and flouting world opinion in the process;
2. everybody saying what a terrible thing this was, but
3. decisive UN action being blocked by governments that opted to stand by while atrocities were being committed, and
4. parts of the media reporting the UN's failure as a mistake by the British and American governments rather than as a cynical act of betrayal by the real culprits.
Is it any wonder that those who really care about injustice on this scale end up by having to take matters into their own hands?