people in the ingroup aren't going to think of you as an ally, they're going to think of you as a heretic
The examples that come to mind for me suggest that they're only going to think of you as a heretic if you identify as a member of the ingroup. If you have exactly the same beliefs but place yourself outside of the group, they'll likely ignore you altogether - you're similar enough to not be worth attacking, and small enough to not affect the group's reputation or inner workings.
Previous Open Thread: http://lesswrong.com/r/discussion/lw/k94/open_thread_may_19_25_2014/
You know the drill - If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should start on Monday, and end on Sunday.
4. Open Threads should be posted in Discussion, and not Main.