Knight,
I don't know these guys, but I'd say they are either a bad batch of men, or you need to rethink how you recruit and do the Sigma Challenge.
I'm a founding father of my BMP chapter, and we have never had those kinds of problems.  How do you guys recruit?  Where are you finding new members?  Also, what is your Sigma Challenge like?
The reason I ask is that some BMP chapters overuse the "no pledging/no hazing" advertisements that may lead to what you are experiencing...no buy-in to the actually fraternity.  You may also want to call in your Greek Life advisor to give a workshop on what hazing actually is, depending of course on that person's view.
Drop me an email at 
benson7824@yahoo.com if you want to talk about this.
Benson