It could be that the users installed AdBlock to block the NoScript ads. In this case, NoScript is giving the finger to the users opinion.
At some point when the default behavior of two programs with similar feature-sets overlaps you just have to leave resolving them as an exercise for the user.
But targeting the other program in such a way is no different than someone installing two A/V softwares. Sure they may conflict in some areas, but if one of them silently disables or cripples the other on purpose... who is in the wrong?