when i POOP do i have to wipe or can i just leave it as it is not a law to wipe ?

There is no law that prevents you from smearing it all over your face either.

no acturly it is needed for proper hygene

it's not like you'd get arrested for not rubbing your a**''

when i don't wipe the excess poop gets stuck in my anal hair and dries up making it itchy and hard to comeoff

Don't wipe, or do a bad job, and you'll wind up with some very uncomfortable inflammation in the area. You'll also lose all your friends from the smell.