Please have a look to Not the Onion
It is filled with news that could not exist in any sane world. Yet they do.
Apply the concept of Fog of War, that means, imperfect decisions made with the imperfect knowledge available at the time.
When the dust settles, you can point fingers and say that great leaders made stupid mistakes, yet at the time, it was ...
There are some resources available online, but they are scarce and only tangentially relevant. You can check out hyperbole in mythological comparisons or hyperbole in literature to get examples, but I suspect you won't find a meta-analysis. That's for good reason.
Exaggeration happens for one of two reasons: to embellish or to teach.
Exaggeration as ...