Not sure I completely follow your second paragraph. Yes, we all fall short sometimes. We all do things that are contrary to God's will. But going to church and missing meetings, IMO, is more like going to grocery store and not getting the groceries; going to the bank and not making a deposit; going to the dentist, and not getting your teeth cleaned. You're already there, now just finish what you started... But as some have mentioned, at least they are coming. That is certainly a step in the right direction. And it's probably more beneficial to befriend someone than to worry about why they aren't perfect.
The point of my post wasn't to make myself feel better because some around me aren't doing all they're asked to do (ie: attend church meetings). I want to understand their rationale; I want to understand what's preventing them from coming to class. If I can help in anyway, I would like to do so. So after thinking about some this topic a little bit, it seems that the best thing I can do, the best thing we can do as a collective body, is simply to be genuinely interested in the well-being of these individuals.