Was All Colonialism Bad?

I’m a devoted student of history. This topic came up with a friend and it led to some lively debate.

There isn’t much more to the question but what’s above. Was colonialism entirely bad? I would argue it was not bad. My friend believes that it was.

Obviously the absolute extremes such as the horrific crimes of King Leopold II in the Congo leave no room for debate, but what about other European nations? Do they owe any apology for their colonial history?
Was All Colonialism Bad?
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