Jim,
because this campaign has been instigated by the anti BDS mob and the Tories oppose BDS

Corbyn also opposes BDS
https://www.theguardian.com/politics/2017/dec/13/jeremy-corbyn-does-not-support-boycott-of-israel-bds-movement

Pfr,
The point I am making is it is unwise to trust a politician's,
and definitely not an agenda driven political commentator's
judgement and public pronouncements regarding 'art'...
It is condemned by Corbyn, Watson, and the whole Labour Party.
To say it is not anti-Semitic is an extreme and racist view.
It is shocking that so many here hold such a view.