Blind loyalty

“Blind loyalty” is being loyal to a person or cause despite the damage the person or cause does. Some people support Trump out of “blind loyalty” for the Republican party. They are willing to excuse any damage Trump causes out of loyalty to the Republican party. An athlete that is told to take performance-enhancing drugs by his coach might not question it because of his blind loyalty for the coach. Blind loyalty usually exists for a superior, like a respected leader, parent, boss, etc.