Humans, should they mature into strongly moral individuals, must first acknowledge and endure the broader consequences of their actions, directly and personally. But most do not. Instead they cede their own free will to others; they shelter themselves within groups — whether familial, political, sports, religious, etc. — or they act in the names of those whose causes they arrogate unto themselves.
And within these groups this loyalty is widely considered to be a great virtue. More commonly though, it proves a great vice. For the truest test of one’s loyalty to any group comes not with a righteous defense of the truly innocent but with a bold-faced, spirited defense of the unquestionably guilty. Loyalty, in this sense, perpetuates immorality.