[@Guardian Angel Haruki] Thanks so much for thinking all of that through and for your character sheet.

A couple of things...

Before the Edicts of Lumen, the type of behavior you're describing from Sir Brutus would have been much more likely. In present day the actions of Sir Brutus would have had him branded a criminal by the church and removed, not cheered on. If he has an entourage, it would be very difficult to find other Silver Order knights who would be willing to be branded as criminals alongside him. What your describing sounds more like a group of frat boy malcontents than an organized order of professional knights who have sworn to uphold compassion. Unless Sir Brutus is a complete idiot, he would know that he'd needs to leave no survivors to his crime or else run the likely scenario in which he is tried and convicted. 

Based on the lore stated in the source books, the religious orders operate in a certain way and therefore would not tolerate this type of behavior. My concern is, based on your character's backstory, you need the church itself to be corrupt rather than a mere stray paladin. Otherwise Im afraid you'll be disappointed when, virtually all people within the church, are behaving entirely different from what you've described above.