In my opinion, Black Buck summed up the whole mess.
It was a well planned, well executed attack that should never have been necessary - just like the rest of it. If just one of our nuclear attack submarines had shown up every few weeks in the South Atlantic, it's unlikely the Argentinians would have chanced their arm.
James Callaghan, in an uncharacteristically sensible mood, initiated Operation Journeyman in 1977, sending the nuclear submarine Dreadnaught and a couple of frigates to show the flag, following which Argentinian fuming quitened down a lot. However, in 1980, Nicholas Ridley's infamous "there is nothing we could do"speech encouraged Argentinian aggression.
It was all so wasteful and so unnecessary.