But what would happen if one state (you know which one) could actualy gain control over more than 51% hash rate though?
You mean the Chinese government? The majority hashrate is already located in China:
https://www.coindesk.com/highest-in-2-years-65-of-bitcoin-hash-power-is-in-china-report-findsWe're still talking about private companies running these mining operations, not the government. The confiscation of private mining facilities to launch a 51% attack seems rather unlikely as China knows better than to kill their own cash cows.