There can be a lot of different stations, and they don't need to all be incredibly tough. Stations can fit a lot of roles like trade, orbital ship construction, or even habitation besides being military installations. Of course, a frontline military base would be tough, but some random trade station in a relatively safe system would probably not be built for combat, and thus should be able to be taken down easily by a moderately sized fleet. Of course, blowing up defenseless civilians will probably not make you very popular.