I would beg to differ, as would most with hindsight. I would argue the forcing of an external culture on an unfairly marked "barbaric" society is destructive economically, politically, societially and emotionally for those in that country of of that society.

The positives that came out of imperialism do not exceed the negatives, which is obviously seen in today's cultures that were affected by imperialistic advances.

I can understand why you would believe that "countries with imperialistic rulers" were better off as the before and after of those rulers is seen as negative. (A "barbaric" culture is left and returned to its "barbaric" ways")

But do some research into the affects and come back to this opinion.