This is a small thing, but I do really enjoy that we've now gotten confirmation that Roland grew up poor, since it adds an interesting dimension to his relationship to the rest of the church.
The chasseurs aren't just militant religious extremists. By and large, they're wealthy and insular militant religious extremists. The lower level chassuers most likely come from a wider base, but among the paladins, coming from established chasseur families seems to be quite common. Astolfo comes from a line of paladins, Olivier seemingly did as well, and though we don't know anything about Gano's family, he apparently grew up comfortable enough to belittle Roland for being poor.
And like, of course this is the case. Of course the violent hateful Catholics are a group full of generational wealth and classism. Of course the anti-vampire extremists were raised in whole families of anti-vampire extremists.
And by the same token, of course the paladin most willing to question what he's been told about vampires is the paladin that comes from outside their insular ranks. Roland is a chasseur because wants to help people, and if Gano is to be believed, he's also in it for the money. Hunting vampires is a job that Roland genuinely believes in, but at the end of the day, it's a job. It's a field he chose to enter into. He doesn't define himself entirely by his occupation of vampire hunter.
It's always going to be easier to brainwash someone if that brainwashing is what they've known for their entire life. Of course the outsider perspective comes from the paladin that's the biggest outsider in other ways. And of course someone that's been looked down upon by society is more receptive to questioning societal presumptions about evil.
None of this is revolutionary, but it's very fitting, and I'm pleased to have it confirmed.