You don't acknowledge continent-scale cultural and human destruction by calling it "injustice" or "inevitable awful consequence". Do you imagine someone saying that about the current situation in Crimea? Millions of people died. It is not just an "injustice". An injustice is a state official forging evidence for nefarious purposes not destroying a country and unaliving its people let alone a whole continent. It really downplays the role of the invaders even more than it already is.
Who exactly was brought together? The natives were virtually or/and culturally wiped out (in case you didn't notice) and the consequences can still be seen today. When you look at the US today, do you see two groups together? How so, when the actual natives have virtually no land have been systemically attacked since their world was destroyed.
Thinking about it in positive terms is no different than doing the same with the situation in Crimea or with any of the world wars.
It is fine to discuss stuff but the idea of bringing two groups together when one of them has been virtually wiped out speaks of severe cognitive dissonance.
There is no whataboutism here because no other continent has experienced what the American continent has. There is no equivalent in written history for the scale of suffering and destruction unleashed upon it.
And you having a problem with me criticising the vast destruction (rather than a generic injustice) of a continent by saying that cruelty exists together (tell me what other continent in the last 2 thousand years got culturally destroyed and had millions of deaths as a result of foreign invaders) says a lot about your opinion about the deaths of tens millions of people (at the very least) the descendants of which still suffer all sorts of challenges. Including the continuous dismissal of the scale of their suffering by people like you ever since the invasions began.