There are only 'incidents' that happen in Kerala. The Govt report states the same. Ergo, there are NO RIOTS in Kerala.
Riots happen in case there is a retaliation, it's a two sided affair. In Kerala there is little chance of a riot anyway. Everyone has beef, pork is not popular, the religion plays little to no role in Hindu or Christian festivals. Only a few conservative Hindus/Christians truly practise their faith. So the vast majority stays neutral during any such incident. Naturally there are no riots. *
There are no riots in the Kashmir valley either. Does not mean communalism does not exist there.
*Source - My interaction with friends, visits to Kerala etc. Not that I imply that all the Kerala Muslims are fanatics. But then far right Islamist political outfits do get elected - something I find puzzling in a place with 100% literacy.