A lot of it is the surrounding areas have been surrendered to the noise makers and residents in my town are friends with them and they come and go as they please at all hours, unhindered by law enforcement.
But dismayingly, more of the residents are getting louder themselves for whatever reason. The worst part is they by and large follow the speed limit but are still insanely loud so the police just look at it like I'm just annoyed and need to get over it.
It's truly the easiest thing to catch. I can't fathom why there's so little interest at any level of government to tackle this problem.