[quote=@IncredibleBee]
<Snipped quote by Raineh Daze>

Coming up with reasons why a character would do a thing is actually essential, though. It's the point of a character.

Even people themselves are basically big balls of incentives.
[/quote]

And within the bounds of an RP, the limits are basically whatever lines the character will never cross and your only ability to work out why they [i]would[/i] do something. Unless a path is utterly abhorrent, the only way for something to be a complete no-go is conceding your own inability to decide on a why.