For your argument to be valid you have to speculate that crack laws are going to be repealed and crack posession legal in all 50 states.
Do you think that's going to happen?
The bootleggers at the time had no idea that the alcohol related laws would eventually be changed.
Regardless, alcohol was illegal at the time - they were trafficking a prohibited substance. It was very much the social attitude of the day - and still prevalent in many bible belt states where the nascar bootleggers lived - that alcohol was a great destroyer of the family and the tool of the devil.