I considered ironic that the user used a positive expression "humanity coming together" for what was one of the most destructive invasions in human history. I suggest you ask any native to America what they think about that term?

"humanity coming together" is definitely a positive expression. The cambridge dictionary says "to help people or groups to become friendly or to do something together, especially when they would not usually do this".

And if you look at the user's text the act of "bringing people together" is framed as something morally good/worthy. In this context, our explorer faced many challenges but achieved something good (i.e. bringing people together).

Imagine if we used that term for other horrifying events in history where a group of people unalived a country's worth of another group of people