Why do people flame? How does it effect the game? How can it be stopped?

Hello Summoners. I've been playing LoL for just around 4 years now and this is the first time I have really thought about this. But I can't come to a conclusion by my self. So now... Here... I ask you guys to help me out. Come with some wise words or try to reason your flame. I need help. I need answers. I think I know how it effects the game. But what if I'm wrong? I flamed when I got frustrated and I stopped after my first ban(Long time ago). But what about you guys? What do you know? Personal experiences?
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