you may need to read up on what incitement to riot actually is. You will find it is not posting stupid racist tweets, saying you don't care if people do xyz.
Ok go look at various cases associated with the riots and note the sentences set by a judge who of course doesn;t work to any fixed rules / laws and makes them up in their head on a case by case basis. Your opinion doesn't amount to anything at all. The CPS's view does. They set the charge.
So in the land of the blind the one eyed is king but tbh few would be bothered to go into the actual legal aspects involved in a certain charge - that's what the CPS is for.