The MC was a terrible person since the beginning, remember when the devil sect killed people and he just heard theirs cries and did nothing? When there was a plague and he didn't help even though he has medical knowledge?

No logic again, this is a military academy for a united humanity spanning 8 planets. 0 discipline and 100% corruption even though everything is monitored and they do everything in public. Is this how they inspire people to defend their fellow humans? Makes no sense that the academy punishes the mc. Even if they are the rulers of Earth, there is still 7 planets, an alien invasion and a public opinion to withhold.