The argument here is that this is exactly how (mostly) European societies hell-bent on colonization have been justifying their actions for five hundred years, with different variations of "amazing stuff" (salvation, weapons, trade goods, technology, medicine...). It's almost universally led to these tribes being subjugated, enslaved, exploited or just murdered outright. Humanity has a terrible track-record on this topic, and we should learn from our mistakes and just leave them alone.