As I understand it, militia was designed by the devs as a buffer for when gangs are not online (remember before TC was during certain hours prior to militia being implemented), so that towns cannot be taken with blue suits. However, with the new mechanics, blue suits cannot take towns, as there are now requirements, not to mention, when PCs are not present, the militia is easily exploitable and defeatable. So now militia is primarily used (and in fact its only effective purpose) as additional defenses. Whether this use for militia, while not the devs original intent, is good or bad is up to the devs to decide, but personally I do not agree with it, because PvP should be just that player vs. player.