There were large protests in the wake of a law enforcement officer killing someone in 2020 too. Notably, there was not a civil war, even though the Trump administration used the protests as cover for bad behavior then too

2020 was a single accidental case as the result of a poor system. Many people even from within the system on all levels agreed something went wrong and apologized. Today's situation is different, as the whole system is weaponized on purpose from one specific layer/group against the other layers/groups of the system. It's an internal conflict within the system itself, and a prime-example for justifying a civil war. And at the time Trump was still on the leash of his own adminstration.