Kruschcev transferred the crimean oblast as a symbolic gesture.
Pointing this fact out does not contradict one's desire to not have Russia acquire more territory and behave in an imperialistic manner today
I have a good dozen of friends from Crimea despite visiting Crimea just a few times as a little kid – thousands of young people were forced out of their homes.
The russian logic is very perverted, yet completely predictable. If you are a national minority (even if your 7% claim was true) surrounded by russians, you should leave, and all your belongings should be redistributed among russians. But if you are a russian minority surrounded by different nations, then everyone around you should learn russian language, respect russian culture, otherwise russian tanks will come. Or maybe they won't, but only for the sake of global stability (otherwise it's justified)