你的句子只能用 in danger from，为什么不用 in danger of，这是由句意所决定的。

in danger from：意思是“面临或受到(来自)……的威胁”。如：

Such areas are often in danger from floods. 这些地区常受到洪水的威胁。

The public are in danger from industrial pollution. 公众受到了工业污染的威胁。

Little did he know that he was in danger from his own family. 他想不到他自己的家里人会坑害他。

in danger of：意思是“有发生（某情况）的危险（或可能性）”。如：

The patient is in danger of death. 病人有死亡的危险。

You are in danger of catching cold. 你有患感冒的危险。

The animal is in danger of extinction. 这种动物濒临灭绝。

The whale is in danger of becoming extinct. 鲸类有灭绝的危险。

The building is in danger of collapsing. 这栋建筑有倒塌的危险。

He's in danger of becoming a national joke. 他恐怕要成为全民笑柄。