How do you assign a specific user fee for national defense? Our tanks, troops, radar systems, interceptor aircraft, etc provide more benefit to someone who is having a $100 million estate protected than to someone who rents a place at a trailer park, agreed? So the more possessions you have to protect, the more you should pay, right? That's the way insurance works, anyway.
Laz, the rich person gains benefit from the roads by more than simply driving on them. Let's say you are the CEO of Best Buy. Doesn't an excellent transportation system benefit you by allowing your customers and suppliers easy access to your retail outlets? In other words, many of the functions of the federal government aid and protect commerce in some way or other. And the wealthy derive a greated benefit from commerce than do the poor.
See my point?