Ragnaros thought about it carefully. He was not thinking about how to protect Arthas, but how to maximize his own interests.
In fact, for Ragnaros, it was better to make things difficult for Arthas.
Why did the humans in the lower realm believe in Arthas as the God of Death?
Because in the eyes of mortals, the God of Death should be fair.
Whether you are strong or weak.
Whether you are rich or poor.
Whether you are long-lived or short-lived.
As long as it is time for you to die, the God of Death will not hesitate to harvest your soul.
It does not matter who you are!
However, as of right now, the God of Death himself had broken this rule.
He personally destroyed his image of fairness and justness.
So, what would happen to those who believed in the God of Death?
Of course, they would give up their faith in Arthas. This was because he had disappointed all his believers.