Because

Do we ever stop and ask why we do something the way we do it? Introspection & careful analysis are keys to increasing market share for businesses but we often fail to do the same thing in our personal lives. The honest answer for most of our habits in family, church, etc. is "We've always done it that way." 

While there is comfort in familiar patterns, if this is the only motivation for our choices we will never determine if what we are doing is effective. Honestly, it doesn't really matter how effective it is if we are unclear about the vision of our future and the steps that are leading to it. When you don't know (or care) where you're headed then your motivation isn't that important to understand.

The refinements that will need to take place if we ask, "Why?" can be daunting. This isn't just attributed to the hard work of change, but to the intimidation factor that comes from things being different from what we have known. It's worth the effort, however, to avoid lapsing into patterns of behavior without understanding the motivation behind them.