It's only legitimate out of context. The two countries were trying to negotiate a transfer before the war broke out. Argentina was ruled by a military Junta and used the invasion to bolster its internal politics. Thatcher did the same thing by using overwhelming force over a territory that Britain was trying to get rid of. An Argentine cruiser was sunk outside of the exclusion zone.
https://en.wikipedia.org/wiki/Sinking_of_ARA_General_Belgrano
Afterwards Britain fortified the island to feed its military industrial complex and drum up more support for its decaying empire. Everything about this war was totally pointless except from a domestic political standpoint.