A conscientious person can get in a toxic martyr loop.

(Something I discovered about myself, with great effort, in years of couple's counseling.)

The martyr sees a thing the group needs, and they jump in to do it... but resent having to do it.

Sometimes they do work that no one asked for, and also don't do a particularly good job at it, and all it manufactures is resentment.

A savior needs a thing to save.

Which means sometimes they'll break things, or allow things to break, so they have things to save.