Please make a note of stations and planets that have this issue.
While a strong Rheinland battlegroup SHOULD be able to penetrate through Texas, it should get horrifically mauled before it reaches Manhattan (Unless it has no capitals etc) and if it got to Manhattan, it should be dead already.
Idea isn't to stop these sort of piercing raids, since they do happen. The idea is to show that they usually result in total defeat for the raiding force and very little actual damage achieved.