So, basically, he wants to destroy the whole association because of a bunch of thugs? Talk about misdirected vindictiveness.
He was betrayed by hunters and almost died in the process, then due to some bs on their end nothing was done about that
So no it wasn't misdirected, it just further proves that humans are complete garbage
Look what happened to the MC in the other world. After putting his life on the line for the humans and defeating the Demon King, they went ahead and executed him and deemed him a monster, and MC did not ask to become the hero, they thrusted that responsibility/title onto him
I now sympathize with the S-rank dude, I'm pretty sure the Demon Queen is the saint who cared about the MC in the other world
So this one is on the humans