His reasons are much better than Madara's, Obito's, Nagato's, or Sasuke's.
Indra became evil because of the extremely severe trauma inflicted upon his psyche when his father gave the inheritance that was rightfully his to his younger brother.
Indra is the man. He should have been the one to inherit everything.
He was betrayed and suffered immensely. More so than any Uchiha.
Although his brothers never died like the other Uchiha, his brother was dead to him, which is really what matters.
Indra became evil because of the extremely severe trauma inflicted upon his psyche when his father gave the inheritance that was rightfully his to his younger brother.
Indra is the man. He should have been the one to inherit everything.
He was betrayed and suffered immensely. More so than any Uchiha.
Although his brothers never died like the other Uchiha, his brother was dead to him, which is really what matters.