Why not get both? Have you seen the new Australian Antarctic Icebreaker RSV Nuyina? Or RV Investigator. You shouldn't need to choose between Defence and Civilian marine project. A healthy country will be able to do both and see the value and worth in both, as they are in fact complimentary. I think everyone can see the worth in having civilian ships with massively powerful weather radars and the ability to create detailed maps of the ocean floor at all depths. A large icebreaker with large landing craft that can carry 45t is always useful. If anyone really wants to challenge your territorial possessions that are sparsely populated, they will likely just turn up one day. So having strong civilian assets is one way of patrolling and eyeballing and being a presence. Which is why China's fishing fleet is almost like another arm of the navy as is its Coast guard. Of course that is just one part of the equation. Large and powerful countries won't care about your patrol ship. That is why you have destroyers and submarines and planes and armies.