If by the “Savior complex” you mean the tendency to look for—or become—the person who will rescue everyone, fix society, or solve another person's problems, there are several reasons it can be so appealing.
1. Uncertainty is uncomfortable.
A savior gives people a simple story: “Someone knows what to do. Someone will fix this.” It can be psychologically easier than accepting that complex problems may have no single solution.
2. People want someone to carry responsibility.
When circumstances feel overwhelming, handing responsibility to a leader, institution, ideology, parent, partner, or even a religious figure can provide relief.
3. Humans naturally look for agency.
We tend to attribute events to intentional actors. A powerful individual can therefore feel more understandable than a complicated system involving thousands of interacting causes.
4. Hope is powerful.
The savior narrative offers something people genuinely need: hope. The danger isn't hope itself; it's when hope becomes dependence on one person.
5. Being the savior can satisfy psychological needs too.
Someone who constantly rescues others may receive validation, purpose, admiration, or a sense of indispensability. Sometimes helping becomes tied to identity:
“If people don't need me, who am I?”
6. It can create a cycle of dependency.
This is where your earlier point about political power becomes interesting. A population can become dependent upon a leader, while the leader becomes dependent upon being perceived as the indispensable protector. Eventually, questioning the leader can be portrayed as threatening the very people they're supposedly saving.
There's a fascinating contradiction:
The more desperately people want a savior, the more power they're willing to give the savior.
And the more power someone receives, the greater the possibility that they become unaccountable.
That's one reason the warning “absolute power corrupts absolutely” connects so naturally with the savior idea. The problem isn't necessarily that the person begins as evil. The problem can be that everyone starts believing the person is necessary.
A healthier alternative is:
Don't look for someone to save you. Look for people who help you become capable of saving yourself.
That distinction applies to relationships, religion, politics, and even personal development. A good leader ideally doesn't make followers permanently dependent on the leader; they increase the capacity and autonomy of the people themselves.