Sir Knight,
Please allow me to explain something. If the situation is such that it is physically or morally impossible for one to attend Mass, the obligation is lifted. As I’ve said before, it’s not always easy to determine what is or is not “impossible.”
Dispensations from the obligation are given (by bishops, pastors, or other priests as applicable) when people are in a position where they might be able to get to Mass if they make some changes, but those changes would cause hardship. Some examples: cancel the vacation, quit the job, walk 10 miles to the nearest Mass, etc. It isn’t completely impossible (like a person in a nursing home who is bedridden, or an inmate in prison).
Sometimes situations stradle the line between these two. How much hardship is enough to define “physically or morally impossible”? If parishioners just aren’t sure whether or not it’s impossible, they can request a dispensation.
Oftentimes, it comes down to how we ask the question. “Do I have a good reason?” is usually not the right question. On the other hand “Is it impossible (within reason) for me to get to Mass?” is the better question.
Perhaps I should put it this way: if you say “I have a good reason to miss Mass” then that’s the time to request a dispensation. If you say “it’s impossible for me to get to Mass” then a dispensation isn’t needed.
The purpose of dispensations is to satisfy those questionable situations. Sometimes these are known ahead of time, like a planned vacation, and sometimes they’re not planned, like the recent snowstorms. Sometimes dispensations are given when they aren’t technically needed. Again, the snowstorm example. Many people in the affected dioceses found it completely impossible to get to Mass (especially the elderly), yet the bishops dispensed everyone. In other words, he didn’t say “anyone under 60 is dispensed, anyone over 60 doesn’t need a dispensation.” Doing it that way avoids the situation where the little-old-lady who drives herself to Mass doesn’t feel any guilt at having missed Mass, even though if she tried to get there, she might have harmed herself or someone else. She didn’t need a dispensation, but by dispensing the entire diocese, the bishop eased the consciences of everyone.
Is that explaining it a little better, or just more confusing?