//For those who clearly do not grasp the difference between the words, 'Jew' and 'Zionist', I suggest you refer to any adequate dictionary.//
If you listen to way he uses the word 'Zionist' in that speech though, it really doesn't make any sense unless it's a code for 'Jew'. This has even rattled people who were long-term supporters of him:
https://www.theguardian.com/commentisfree/2018/aug/24/jeremy-corbyn-antisemitism-labour-zionists-2013-speech
In fairness this same argument - i.e. what to do when a party whose policies you like houses racists and extremists - came up quite seriously when UKIP were first doing well in the polls. I recall plenty of people at the time saying they were quite happy to risk voting in racists and misogynists because the policies at stake were too important to them to think about anything else.
Still, that was a wrongful position then and it's a wrongful position now. There's a clearly a serious problem in Labour and it's extremely difficult to consider voting for them in good conscience.