Every single aspect of colonialism was negative. There were things that came from Europe that were positive, but colonialism was not one of them. These positives could still have arrived on these shores through trade and mutual respect, the brutality of colonialism was not necessary and in fact held things back. How long were indigenous people denied access to these benefits because of colonialism? Most people only benefited after colonialism fell, before that it was restricted to the colonialists themselves. Look at all the countries in the world that were not subject to colonialism and yet, somehow, miraculously have access to European technologies. You need to differentiate between the things brought to this country from Europe, some of which were positive, with the brutality of colonialism which was all negative.