Because civil and criminal ''laws'' are not laws; just a few examples of contradictions:
- ''criminal law'' says it is illegal (i.e. morally wrong) to initiate force against anybody to steal, yet it creates exception: when you do not pay the protection fee, i.e. ''taxes'', the so called criminal law ''allows'' to steal property from you to pay it against your will; can you imagine a gravity law that says ''every object dropped from a 10th story falls into the ground with an exception of a child (because child might get hurt)
- ''criminal law'' says it is immoral to beat the shit out of other people unless attacked, yet ''allows'' the police (guys in blue costumes with sign ''police'' on their huts) to beat the shit out of you if you do not appear in court on time; can you imagine Archimedes law that says ''any object drowned in a bathtube displaces the amount of fluid equal to its weight, except for guys in blue costumes who will displace 1/3 of their weight''?
That makes no sense. At all.
Ignoring the fact that you apparently think taxes are stealing (even though you are provided with education, fire dept, police and military protection, roads, social safety net, etc, etc with those taxes) and the fact that you believe that police can legally beat you for no other reason than a failure to appear in court; the fact that a rule/regulation/law may be specific enough to provide exceptions to said rule, doesn't mean that the rule is invalid.
Besides that, as I stated before, laws represent the collective will of the people. When laws like the Jim Crow laws are no longer considered acceptable by the general public, they are removed.