Because that's what makes it wrong. If "better life" for one is profiting off slavery and genocide and for the other its "chance at a peaceful life" then comparing them whitewashes the formers intention.
Edit: it also seems to elude everyone that literally the first line in my source goes against the "seeking a better life" line, so I don't know why people think my source doesn't cover that
Why is that relevant?
Because that's what makes it wrong. If "better life" for one is profiting off slavery and genocide and for the other its "chance at a peaceful life" then comparing them whitewashes the formers intention.
Edit: it also seems to elude everyone that literally the first line in my source goes against the "seeking a better life" line, so I don't know why people think my source doesn't cover that