Depends on what you define as responsible.

The NSA's bulk data collecting has been cited as the investigation's initiating factor in 4 out of 225 terrorism-related investigations, that's 1.7%. Is 1.7% worth it? I guess the Australian government said yes.

Source: http://america.aljazeera.com/articles/2014/1/13/review-finds...

No. The programs are not about terrorism at all.

Check for other comments on this thread (I posted a lengthy one) for details.

An answer that usually works:

Absolutely, because there have been no large scale terrorist attacks.

"Why are you waving that handkerchief?"

"Keeping the elephants away..."

You know the rest.

The thing is that they have been doing just fine with their current powers - there is no need to expand them. I have no doubt that actual terrorist plotting has been countered by ASIO, but I also have no doubt that ASIO clearly already have enough powers to do their job appropriately.

Implying that there is such a thing as just enough power.