I do think it’s important to realize the damage colonial powers have done to indigenous populations and to realize that we developed countries are continuing to do damage. We need to understand that we’d probably have participated in various oppressive actions (including slave-owning) if we’d lived in societies where these were considered normal, so that we can stop ourselves from doing similar things now.
However, wallowing in guilt about these things doesn’t help anybody. In fact, it can paralyze us when we need to move forward. So look forward. We can reduce our ecological footprint. We can provide some help to others. We can teach. We can help build a big database for researchers and help make others more aware of the natural world around us. Lets go do those things.