Well the reason for that is simple, bunyip, Labor didn't want to fix it. They were quite happy, with thousands of probable factory foder/ welfare recipients, flooding in, it bolsters Labors voter base.
The main reason Gillard and Rudd allowed illegal immigrants in to Australia was to create division and dissension in the community.
http://www.restoreaustralia.org.au/fabians-and-pm-gillard/
They have opened the doors to illegal invaders who are bringing in a religion that goes totally against our way of life. They are using Islam to create divisions in our society and turn citizen against citizen. At the same time, they have neglected our own needy; our aged and veterans, the very citizens who have contributed so much to our country and who should now be enjoying the fruits of their labour. Instead, they are living on the brink of poverty.