Why Red John didn`t kill Jane ? I think because is someone who know him and cannot kill him ... i have many scenarios ... i think in the first time , the crimes was made by jane and his father ... and they kill someone from CBI ... maybe Virgil Minelli son / daughter , or someone else ... and He find that jane is the criminal and he revenge on jane`s family ... i don`t know for sure ... but i think Red John could be jane`s father or someone who find that jane is a serial criminal  , and with his new crimes want to make jane responsible because in the past he investigated jane`s murders ... another thing ... i think kirkland suspects jane to be red john ... because when they meet he said to Jane "You don`t know me ... but i know you "  . this is why they don t trust lisbon because they think she is jane accomplice