who wouldn't be concerned?

for goodness sake!  what's the Navy doing?  Could have been a terrorist bomber?

19 boats arrived on the mainland of Australia UNDETECTED during the Howard years, so nothing new

http://www.theaustralian.com.au/national-affairs/immigration/mainland-boat-arrival-an-exceptional-case/story-fn9hm1gu-1226618054731

Might not be new but that is not the question... 

I feel that there have been so many boats and asylum seekers that people seemed to not even care that a boat has arrived.... 

I was not really surprised and am really not sure if I am concerned.. lol.. I don't know if that is a good thing or a bad thing.. 

We have such a big country with a huge coastline, it is not surprising.  But it is concerning.  I would be more worried about a nearby country with a population of 240 million.  That's why we have to stay very friendly with them and give tham lots of $.

undetected - yes, a big concern.