Understand if there is a archetype "Crusader" it is a journalist. Whereas ideally people who become journalists would have the truth be their ultimate goal, most are crusaders who sadly just make themselves shills for a political crusade.
Why is it then journalists and media types are so prone to become crusaders?
Because they are predisposed to it. The type of person who goes and majors in journalism commits the "First Sin of Crusaderism" by majoring in something that doesn't take a lot of effort, doesn't really produce anything of value, yet expects society still provide them a living has a dishonest personality. They don't care about anything as noble as reporting the truth and being the fourth branch of government. They care only of themselves and shills whatever one political group or another tells them to go.