Developing defence capacity is a basic responsibility. Humans can scream foul if they lose out to machine hybrids or extraterrestrials.

So what, it’s your own fault if someone assaults you and takes away your things?

I mean, kind of?

Not in a morally absolving the attacker way.

But in a you had agency and chose to underinvest in defense way.

That said, it's pretty unlikely the rest of the world could have defended against a technologically advanced Europe / Middle East / China, at their respective peaks, and especially after transoceanic sail enabled cross-sea logistics.