There are so many players in the league community. Focusing your energy on getting others banned is unproductive. Let Riot do its job. Send in a report ticket and hope that they will be banned if they keep trolling. Some players only rage for a couple of games before returning to a normal play style. You may have caught someone at their peak (e.g. they have lost a lot of games or maybe they had a troll in their previous game). Whatever the case may be, this is still unacceptable behavior and it ruins the game for others. I know it is hard to do, but you just have to let it go. Don't let others infuriate you. You are giving whatever players raged/trolled/whatever your consent to upset you. Don't let them. Just ignore their childish behavior and move on. You decide how you respond to others, and trollers are getting what they want when they make you mad. Just laugh if off and don't give them what they want.