But instigated by 'who' and 'why' now...???

Definitely a conspiracy instigated by Jews/Zionists in order to discredit Corbyn and the Labour party. They tricked Labour party members into making antisemitic comments so that they would reveal themselves as being antisemites. The Jews/Zionists, besides controlling world banking, governments and the media, have extraordinary powers to effect people into saying things that they don't really mean. This is but only one way these nefarious people exert their will upon the unsuspecting.