Israel is pretty closely tied to the EU. Their Universities are all part of the Horizon-Program and they are part of the ESC (as is Austraila)

So angering the EU could be a pretty bad move.

The EU has so far stayed pretty silent because

1. the free-gaza movement has been largely hijacked by radicalist hamas-supporters and terrorists
2. The EU also has a history with Islamist Terror-Attacks so we pretty much understand the Situation Israel is in

But it sees that the rather careless approach of Nettanyahus Government in regards to Civilians has now pushed the EU over the Edge.