"Homosexual" is not a slur it means person attracted to someone of the same sex.  It is telling however that you keep coming back to this and find offense in the term "ammosexual" it simply refers to an attraction to ammo, it is 2016 you are free to love any way you want.
Back to the point at hand though, if all ammo purchasers pay said imaginary tax then it is possible that some of the actual offenders would also contribute ( for discussion sake I am not mentioning folks who make their own, realistically it would have to be a tax on all components).  Only people who fly pay  air security tax including terrorists! Are you saying  people who never fly should  pay too?