Its a constrained Google search. Without the constraint of it being specific to individual posts or specifically rpghorrorstories, I get over 13,900,000 results but no confirmation any of them is relevant. Basically, consider it like a forum. 7,000ish individual topics on alignment being the cause of groups breaking apart isn't what I'd call small. Remember, that's only the ones posting in there, and not the people who aren't posting at all.
Its regular enough its clear alignment has these issues. Is alignment worth 7,000 games of D&D being broken up over? I argue no, it does not bring enough benefit to the game for the harm it causes when used poorly, and it being used poorly is incredibly, incredibly common