|True. But don't miss Mass.|
But we have to say something. If people don't take Hell seriously, they won't take sin seriously, and it becomes trivial whether one goes to Mass on Sunday or not. If those who excuse themselves from Mass (for trivial reasons) complete their current journey to Hell – that is, if they arrive at the destination their current itinerary suggests – it seems to me that they will have a special hatred for all the priests who told them it was okay and not a sin to miss Mass on Sunday. Maybe we can hope that God gives them a pass because they were so woefully misled. But you can only go so far with the excuses of “we didn't know”, or “our priest told us it was okay”, or “I was told in Confession that it wasn't a sin”.
People making these excuses already show enough brainpower to be able to rationalize well, so their own excuses will appear flimsy to them at Judgment.