WRT pro 2: SAMs cannot really provide this capability, as they have limited/No capability to ID, but certainly no capacity to discern what is actually happening to an aircraft, and thus no capability to graduate a response. E.g has an airliner been hijacked, or is it just a radio failure? If you pull a fighter alongside they can look into the cockpit, look into the cabin, provide a contact to follow, or conduct warnings. You can’t do that with a SAM; you either shoot it down (potentially without full picture of what is occurring), or let the aeroplane go on its merry way.
I get that in a civilian environment sense, but we are considering an environment where a responsible Government interested in reasonable measures to protect it’s own airspace, rather than one in which an ideological driven government is in power, which having the benefit of a benign strategic environment has deliberately emasculated it’s own defence force for no other reason than to suit it’s preferred ideology.
However that attitude has existed in a strategic environment where they perceived any threat to their territorial integrity as being so low they could afford this lax approach.
They are now potentially faced with Chinese naval and perhaps air forces which do include long ranged missile capabilities, being based even if temporarily within direct strike range of many Chinese capabilities.
I perceive (rightly or wrongly) that the ACF (as it was called when it existed so I’ll keep using it for simplicity’s sake) represents everything they abhor about military capability and even a threat of Chinese aircraft flying along their territorial limits may not be enough to change this bias.
A purely defensive modern surface to air missile system however provides an ‘out’ to the argument that they are doing nothing against such a threat, at most likely a cheaper cost in acquisition, sustainment and manpower compared to a full strength fighter squadron, or greater.
Organisationally too, I would imagine it be much more straight-forward to establish a SAM battery or two, along with an appropriate IAMD and air surveillance system, than it would be the same system and a LIFT and a fighter capability amd all that goes with that…