They aren't concerned about crypto being rigged, they are concerned that they aren't the ones rigging it! If they don't like market manipulation, there is plenty work here to do in the markets we have...but hedgies already benefit from manipulating those markets and have used a fraction of their profits to buy themselves the US Congress. So our oligarchs can sleep safe and sound knowing nothing will threaten them in the US securities market.
But that's not good enough. Now they want the crypto markets tipped and rigged in their favor as well. But, as you say, that's going to be harder when it is a global market, located in myriad countries and subject to other competing corrupt governments.
What a world we have were the little guy's best chance at a level playing field is competing corrupt governments...
Haha well said!