If aliens invaded earth and after decades of subjugation they successfully "integrated" us savages, they would view it the same way. The forceful destruction of all our culture, languages, religions, history, sovereignty, it would all be justified in the end because their alien technology and culture is "superior". I don't believe it's justified no matter how relatively primitive we are, and if aliens did it that alone would demonstrate their own primitive culture quite clearly no matter how much they whitewash themselves in the intergalactic history books.

I didn't said empires were good, just that in the rhetoric 'empires are bad', the Roman empire isn't the best example, especially since the roman usually didn't engage in forceful cultural destruction.