[quote=@SleepingSilence]I've seen a person drop an RP midway through because they didn't like "how the plot was unfolding." 
[/quote]
I have done the same thing. If the RP fits a direction I oppose, I will discuss it but if I come to a conclusion where I am not going to enjoy myself I am going to respectfully leave and move on. It is a legitimate thing to do.