You CAN do whatever you want, but there are rules on the bark for a reason, and breaking any of them according to your role is, while valid RP, essentially declaring open season on yourself when it comes to an Outlander Imm or NPC messing with you.

Some Outlanders are going to adhere to the dogma more strictly than others, but if you roll with conjurers, for example, I can't imagine Lyristeon is going to say, "Eh, his role explains why he rolls w/ Outlander but doesn't necessarily dislike conjurers. It's all good."

Despite not caring for civilization and order, Outlander does have rules that are based on it's dogma, and joining the club as a like-minded tree-hugging arsonist hippie means you play by the clubs rules, at least for the most part.

This is, I'm guessing, why Outlanders have gotten slapped before for using town healers, assisting the wrong types of Forts (Paladins, etc.), and doing other things that a particular Outlander might not see as being so bad, but the cabal itself would.