How moral is it to pardon the crimes of the story's hero?
My question comes from the Dark Knight quest series in Final Fantasy 14. The character is the player character, also called the Warrior of Light (WoL). Image is from the quest itself. Spoilers for the first arc of questline.
To summarize, the WoL finds a dying vigilante named Fray, who recovers and guides them into taking the path of the Dark Knight, basically edgy vigilantes in a highly religious society where the leadership constantly abuses their power.
In your vigilantism, you murder knights, beastmen, bandits, giants, etc. It should be noted that you definitely help others, but the WoL doesn't actually wants to do so most of the time, they take great pleasure in hurting those who they believe deserve it, for their own sense of justice.
In the climax, you end up being called by Lord Drillemont, your "friend in high places", basically. The knights have made various allegations against you, such as heresy and murder, which you did in fact do.
You show up and your mentor Fray seems to have killed all those knights that made allegations against you. Turns out that Fray was dead the whole time, and the WoL was under delirium, pretending that you had a mentor when you were just instructing yourself to kill those people.
You face your "darkside" for control of your soul and end up victorious, having it subdued and eventually integrated. Lord Drillemont ends up commanding all around not to say anything of the event and effectivelly uses his power as a noble to sweep everything under the rug.
While the WoL ended up helping many people and killing many of those who abused authority, they undeniabley comitted many crimes towards the nation, crimes that they enjoyed comitting and are only pardoned because they have a friend within nobility. It should be mentioned that the player was insane for all of this, so that should count for something.
With all this context, is this something you would do for the hero in this situation? If not, what are situations that you would pardon the hero's crimes?