Comment by rigonkulous

This is only happening in order to protect the UK states' control over the territory.

Altruism isn't the priority - just the pitch. The real priority is to ensure Tristan Da Cunha remains property of the UK - which, if the colony were to fail, would be immediately endangered. This is why the imperial military is involved, not civilian organizations - the military target is to ensure the island remains the property of the UK.