If it does it on it's own, it rises.
If someone acts on it to make it happen, it is raised. Raise will be a transitive verb in all the example I can think of.
I raise the flag.
I rise to sing the national anthem.
Community anger over the issue is rising. (No one is physically making this happen.)
You raised a good point in your discussion.
Edit: I seem to remember that what we call self-rising flour in the US is called self-raising flour in the UK, but, but it's a reflexive - it raises itself. This is probably best thought of as an exception.
Interested in Language