Oh god bless his little Irish cotton socks, we are not the EU, so he probably doesn't understand Australian immigration law:
You cannot enter Australia if you have breached certain laws, and will be deported if you do so in Australia (just google the Kiwis who are sitting in Immigration Detention Centres around Australia and on Christmas Island - you will see them all waiting to be deported for crimes committed on Australian soil).
There are laws prohibiting people from places such as New Zealand entering Australia if they are criminals - that will definitely not change.
You cannot have an open border (or 'domestification of flights') whilst these laws exist.
They are there for a reason, and should be there.
Any person flying from New Zealand should be subject to vetting, as with any other country. As they do to Australians visiting their country.
This will never change (unless we become one country, which will never happen).