It's been a long time since I watched this film, however your post has made them consider Creation and Destruction...which to me are diverse sides of a similar coin.

Creation is as much a demonstration of annihilation as it is making something new. I've been a long lasting creator and this is something I've come up against everytime I've put up another item for sale to the public. In the event that you make another item, doubtlessly it is intended to supplant something that is as of now being used. Individuals dependably say they are searching for the "as good as ever", yet that is infrequently the case. Numerous individuals have a personal stake in the present framework/item/technique, similar to makers, wholesalers, salesmen, retail and even customers...and they don't need things to change. Change is hard. Change is work. Change is startling.

Therefore, with a specific end goal to bring change, one should ususally be exceptionally forceful, even savage (contingent upon how you characterize "savagery"), since you may need to decimate what is now there before the "better than ever" can have it's spot.

That is the thing that I think Ed Norton's character needed to do before he could go up against his new life: totally obliterate his previous lifestyle. His strategy for his change was battle club.

That, or he just went fucking crazy...I dunno.