That doesn't matter.
The incident demonstrates the attitude being taken and the ineffectuality of the police to maintain the law as it stands.
I feel that the officer was in an unenviable position - he knew that if anything kicked off (and these crowds are both extremely volatile and have been emboldened because they have never been subject to any form of control) then there was no way that he or other officers could have protected Mr Falter.
It was handled badly and clumsily, but Mr falter is right. he should be able to walk down the street without being under threat of physical harm - even if he's being deliberately provocative - that shouldn't matter. He should be safe.
However demonstrators such as these haven't been properly policed since they began. The violence and the threats shouldn't have been countenanced from the very start. If there aren't enough met officers bring in the riot squad/ water cannon etc and let them sort it out. Much more peaceful demonstrations than these used to be broken up at one time. It should never have got to this stage. The anti-semitism we are seeing is horrific.
I do think the police officer was in an awful position. He tried to handle it, but whichever way he chose it wouldn't have ended well.
Mr Falter has the right to walk through the streets unaccosted - it's as simple as that.
Edited to agree with @lechiffre55
The police should have escorted the jewish man wherever he wanted to go, and arrested anyone who threatened or attempoted violence.