@maxdancona,
That heritage of colonialism (not sure if I actually have any), while appearing shameful in retrospective reflectiveness, is part and parcel of what brought the U.S.A. to where it is today. Including the abolishment of slavery. Of course, the U.S.A. (and other nations, and not just whites), continue to impose their own beliefs, values and will upon others, long past the time of colonialism.
People - all people, make decisions. Some are obviously disastrous and that is clear immediately. In a number of instances, it's known prior to an action or series of actions being perpetrated.
Shameful. Disgusting. Sickening. A whole host of adjectives can be used. Even in situations where things are done with the intent of helping, it often turns out badly.