Well then just about every man, woman, dog, cat and bird in Australia would be wrong.
Why? Well, just because people arrive by boat, this does not make their arrival "unauthorised" or illegal. In fact, arriving by boat and seeking asylum is perfectly legal - as it should be.
Would you like some evidence for that, 2301? Well, the UN Refugee Convention of 1951 makes it clear that people arriving on the shores of signatory nations (of which Australia is one) are perfectly within their rights to seek asylum and have their claims assessed without punishment or repercussion. Articles 31, 32 and 33 are particularly clear on this.
Hence perhaps we could stick to the term 'asylum seekers' rather than 'illegal' or 'unauthorised' arrivals? Those terms are both unfair and incorrect.
Here we go, pages 31 and 32 state that:
refugees unlawfully in the country of refugee
The Contracting States shall not impose penalties, on account of their
illegal entry or presence, on refugees who, coming directly from a territory
where their life or freedom was threatened in the sense of article 1, enter or
are present in their territory without authorization, provided they present
themselves without delay to the authorities and show good cause for their
illegal entry or presence.
The Contracting States shall not apply to the movements of such refu-
gees restrictions other than those which are necessary and such restrictions
shall only be applied until their status in the country is regularized or they
obtain admission into another country. The Contracting States shall allow
such refugees a reasonable period and all the necessary facilities to obtain
admission into another country.
The Contracting States shall not expel a refugee lawfully in their terri-
tory save on grounds of national security or public order.
The expulsion of such a refugee shall be only in pursuance of a decision
reached in accordance with due process of law. Except where compelling rea-
sons of national security otherwise require, the refugee shall be allowed to
submit evidence to clear himself, and to appeal to and be represented for the
purpose before competent authority or a person or persons specially desig-
nated by the competent authority.
The Contracting States shall allow such a refugee a reasonable period
c o n v e n t i o n
a n d
p r o t o c o l
within which to seek legal admission into another country. The Contracting
States reserve the right to apply during that period such internal measures as
they may deem necessary.
prohibition of expulsion or return (“refoulement”)
No Contracting State shall expel or return (“refouler”) a refugee in any
manner whatsoever to the frontiers of territories where his life or freedom
would be threatened on account of his race, religion, nationality, member-
ship of a particular social group or political opinion.
The benefit of the present provision may not, however, be claimed by
a refugee whom there are reasonable grounds for regarding as a danger to
the security of the country in which he is, or who, having been convicted by
a final judgment of a particularly serious crime, constitutes a danger to the
community of that country.