The issue with your cases based on what i see is
case1; you got baited Draven flamed you and guess what you flamed back rather then saying stfu and putting him on ignore that's what its there for. For all that calling the other players kids you acted no better.
case 2; The morg was upset rather then let the situation die down you taunt her and flame her. Then you purposely deny her blue buff just to harass her. Your actions escalated the tension in your team then when the cancer remark was made you use that to justify your actions for the whole game. So the 36min of your negative behavior before that remark are ok because it was said to be fair I disregarded the last 15 min of the game so your intentional feeding not with standing you still deserved your punishment.
In the future rather then bicker with your teammates just let sh-- go not everything has to become a back an forth argument. You could have ignored the draven. You could have said hey morg my play style makes me have mana issues so i took the buff the rest are yours, but you didnt you opted to disrupt the game for your other 3 team mates and they reported you.
They were negatively impacting my ingame experience, not just the verbal harassment.