Wouldn't that similarly nuke the entire notion of sidechains? If miners fucked around with L1 and chose to reorg blocks to favor a cartel of miners, then it would destroy everyone's faith in Bitcoin and people wouldn't use it.

If miners did the same to DCs, then it would destroy everyone's faith in DCs and people wouldn't use them. Bitcoin would remain unscathed.

Ofc, in either case, that's not the economically rational decision, so game theory says economically rational miners wouldn't do that. 

 It could set up a path.  One day, some miners are struggling so they decide to collude and mess around with a drivechain. Drivechain go south. A year or so later, the same miners are struggling, now they’ve already grooved the road to collusion.   People often overestimate the speed at which miner collusion would destroy the value. It wouldn’t be overnight. Plenty of time to take their profits and go do something else.