I exclusively play L+ characters. Occasional C ones are switched to N or L as soon as feasible.
I mostly enjoy being the good guy and all that. Additionally, I feel that only the good (L) characters truly want to close the chaos gate - C chars after all represent in part the same forces of ChAoS that seek to dominate, twist and corrupt the world of Ancardia.
Why would any C character want to close the gate in the first place rather than joining those who control it and use it for power?
Also, I often play characters that start C and then gradually turn them to L, as a kind of rebirth, washing of sins and eventual redemption
Somebody mentioned that this is a virtual world and just a game.
I feel it's a bit more. Adom plays a bit like you were reading a fantasy book - even though both portray fictional, unreal worlds, you still root out for some characters, usually the good heroes and wish the villains to fail.
This is directly translated (at least in my case) to Adom - I play good chars because I wish for that imagined world to finally defeat the evil forces and live happily ever after.
Typically, I feel that the real world in which we are all forced to live is a variation of a dystopia, with corruption, deceit and struggle for power and control. I cannot change that but I can make up for it with little acts of goodness in an imagined world - hence my preference for L+ characters.
There is a more mundane reason for being L+ in Adom - the game is easier. You don't have to worry about being sacced on a black altar, virtually all monsters are either N or C so there is no problem with saccing them, L+ champions have better situation versus negative effects of corruption etc.
I understand the concept of channeling anger and all the negative feelings into a game but personally I prefer different games for that.
Mortal Kombat is a good one, without always discerning between good and evil (although that basic conflict is of course there) but at the same time just giving you the control over that funny person on the screen and letting you make a mess of some other guy.
That way my anger is effectively vented out through brutality and violence in the fictional world, while my file remains clean in the real world
"Hell is empty and all the devils are here."