In the fullness of time the causes will be revealed. If it was a birdstrike, it must have been some flock of birds.
In the meantime it sobering to think that a modern airliner operated by a first world airline could end up like this.
As a pilot - it reminds us that it can happen anytime, to anyone.
As a pax - reinforces the importance of listening to the safety announcements and reading the emergency card in your seatback pocket.