This may come as a surprise, but most professional historians don't accept the idea of there being a singular "truth" to be known. I'll link some different perspectives discussing this ([0], [1], [2]), but suffice to say that most historical work becomes dramatically less useful to society if the primary purposes of history are to satisfy our idle curiosity about the past and figure out some objective temporal ordering of events. Those fuzzy questions of narrative and "propaganda" are a huge part of why we do history, even if they cause all sorts of issues.