Brotherhood and its foolishness..

So i was wondering what others had to say about the topic. The brotherhood is significantly diminished from three sometimes I feel like thats a slight for their addition in fallout three but my question really is, why cant i convince the brotherhood to get more active without an uneasy truce or just having them be hostile? Maybe its just an oversight but ive always felt like the brotherhood was more of an 9rder than a militia, fallout 4 changed that quite a bit- but as more of a teutonic order as it is in 1, 2 & nv i feel like you should be able to sway them, do you guys feel like this is a developer oversight like me? Or is it perhaps more of a message; the brotherhood is backwards and its mission is corrupted by good Ole human nature? Edit- playing an ncr run but I feel like the brotherhood aint so bad as it is with mcnamara, hes just cautious and doesnt have much ambition, is that so bad for an order bound to the idea of protection and preservation?