I fucking hate when authors make Isekai inhabitants excessively stupid for the sake of making the protagonist seem smarter. You're really telling me the knights, whose whole job is killing things, have no concept of burying bodies? The thing we've been doing since fucking prehistory?!? Sure, they didn't understand bacterial colonies and other microscopic ailment causers, but they weren't braindead. The concept the dead can spread disease is common fucking sense! Hell, even if it weren't, no one wants to live around a bunch of goblin corpses! Why can you not even conceptualize getting rid of them until Isekai saviour explains it to you?!?