Walking away shows weakness. Still, such and event may later be regarded as historically interesting. I think that many Europeans view Israel as a western state and that's why they want it to have extremely clean moral values (conveniently forgetting European values during Yugoslavia-war). By walking away Europeans want to show to the world that they are different from Israel. They don't know that no matter how often they walk away, most muslims in the world regard Europe as a (weak) slave of the USA and Israel as a playground of the USA, which is not that far from the truth. This walking out won't fulfill any political aim and is also dumb on an intellectual level.
Opposition leader Isaac Herzog calls on government to allow Syrian refugees into Israel (Haaretz)
from the article: British MP walks out of debate, saying 'I don't debate with Israelis'