The game itself is chilling and unsetlling , but im tryin to figure out if it has a story at all or if this guy just went crazy and shot up everything in sight.
I'm new to the first one but not the second one , sorry if this seems like a dumb question but , does Postal Classic and Uncut have a story ? or a reason Postal Dude is Going Crazy(or Postal)

There's really no story to speak of, but a few things can be pieced together.

a) The original instruction guide seems to mention some virus making the towns people go insane and start murdering people.

b) The moving van in front of P. Dude's house might be insinuating that he's been evicted and is going postal out of frustration.

Honestly, though, there's no really coherent plot to speak of. It's just about running around and killing stuff. ;P

I personally after just completing the game think hes just gone insane , and suffering from psycosis , after the *spoiler* schoolyard *spoiler* since u couldnt kill anything and after if i remember its doctors talking,

Well there is some huge dark undertones in the game which I'm not sure were ultimately on purpose but really added to my experience. Just the little things like in the soundboard the Postal dude isn't identified as the "Dude". but as Daemon. Which kinda plays off the fact the Postal Dude's diary in the manual seems like a normal person, but the diary entries in the game made by a mentally insane man, and eventually the diary in the manual and in game start to converge, possibly showing the Dude's last ounce of sanity leaving. But this is all speculation, but it would be cool for this to be explored if they want to make Postal 4 like the original.