Ok, we have tried to understand random encounters from a gameplay point of view, what if they were part of the story... the untold story
Lets contextualize, we are talking about our hero traveling from point A to point B, and through the journey, battleling monsters you cant see on the map to (in some ocassions) face a boss which you CAN see on the map... What happened between point A and point B? What did you face? How come only YOU(`r hero) can see "them"?... as if the perception of reality is altered ooooonly to you(`r hero)
What whould Eugen Bleuler say about this?
Ding ding ding... Schizophrenia!
Yes, all our beloved RPG heros are mentally illed patiences probably escaped from Lovecrafts Arkham asylum. Schizophrenia commonly manifests with
hallucinations, hello! random encounters?
Paranoia, you just know they are out there waiting for you, dont you? So go buy more items!
Bizarre delusions, the choosen one complex, It only has to be you right?
Why do you think rpg heroes dont talk? They are in a motionless, apathetic state... catatonia
Lets breeze through the some of the causes of Schizophrenia
º Childhood experiences of abuse or trauma list are risk factors for a diagnosis of schizophrenia later on.
Kinda like... seeing your parents get killed, your home village burned or your neigboors forgetting all about you...
º Schizophrenia is hereditary... to some degree
Thats right kiddo, your dad was that great hero Maxim who also fought random encounters in the fortress of doom
º Although about half of all patients with schizophrenia abuse drugs or alcohol(or hp potions), there is no sufficient evidence for them to be a connection to a cause of schizophrenia
Yeah... but no one has made a study about Mako energy... right? RIGHT?!

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But Avadan what about the other party members, why do they also fight those random encounters monsters?They are patronizing him, I mean he is still going to kill that lonely boss sprite at the top of the abandoned last dungeon attempting to destroy the world, why not play along? And most of the party members must have met the main hero when he was saving their asses from REAL monsters... so I guess they feel sorry for him thats why they play along and "die" to be magicaly revived with a rooster... I mean pheonix feather AND really die when stabbed by a sword
...and you are not going to say NO to a guy that can throw a Luminaire up your ass! Probably all party mermbers have been taken hostage by your sick hero and leave "help me" notes in every Inn you stay in...Go check!!