So if more than 50% of population haven't welcomed Russians, then Crimea now has twice less population, right?

It's very easy to attribute such disappearances to the evil KGB to promote political agenda, while there are far more probable explanations. It brings to mind the "Heavenly Hundred", a significant number of those people haven't even died on Maidan, but to promote the political agenda they have been promoted to national heroes, even though their "heroism" is dubious at best.

I've personally met with people in Crimea who kept Ukranian citizenship and I haven't heard about any significant oppression from them. If you don't trust me, just read this article: https://tsn.ua/ukrayina/zhiteli-aneksovanogo-sevastopolya-pr...

Have the evil KGB killed and tortured those people? No, they have been simply ignored.

Now compare it with https://www.youtube.com/watch?v=atm0W5wA2y4

Because that whats happens when your gathering is not in line with government agenda. One day prior:

https://www.youtube.com/watch?v=WMKraUk0BSQ

And don't tell me that's organic that suddenly bunch of big guy "civilians" appear and start using force. We have heard about green little men. So there are gray little civilians also.

And Crimea does not need to loose 50% population that does not agree. It's enough to "disappear" few more prominent activists to scare the rest.

Severe repression for some and a welcoming majority are not mutually exclusive. This is why politics are complicated, especially in regions that were passed around for decades or centuries and have very mixed population.