It’s hard to find a more contentious and bigoted historian than Henry Charles Lea. Except perhaps his British counterpart-bigot, G. G. Coulton.
That he “used original sources” is meaningless. Anyone can do that. The Devil cites Scripture. It’s how he and all other historians use original sources that matters. Lea could spin things with the best of ‘em.
No one reads Lea anymore.
But if you a reason to call him “bigoted” please share. Remember Peter Damian used the term “Gomorrah” to refer to what he found among the priests.