"Blind loyalty" means being extremely loyal to someone or something without questioning their actions or decisions, even when they may be wrong or harmful. Full definition
We expect players to be loyal towards the club, lets start showing some loyalty to them too, not blind loyalty, just reasonable loyalty. (justarsenal.com)
So I am kind of proud of our loyalty, but we should recognize blind loyalty for what it is. (sbnation.com)
IMO people with blind loyalty need to re-evaluate their life (not aimed at anybody here). (thesixthaxis.com)