Well, doing so takes effort. This effort comes at little payoff. You can't say "hey, I got this worthless law that no one knew about stricken from the books" and expect people to applaud your efforts. In fact, they'll say: "why aren't you working on something important?" People don't care about useless laws unless they impeded their daily lives, and if that were the case chances are there are forces on the otherside trying to prop them up.
Also, the fact that useless laws clutter up the system is good for the existing political elite. It makes it so that others can't work as well on their level and thus random Joe isn't a threat to the (re)election of someone in tune with the existing system. If someone says something about immigration reform while runnign for office, their opponent can smear them by saying they don't understand the laws. And smears, sadly, work far too well as a means to convince the general public.
You do not have the right to never be offended.
