Many go to Mass and are as bad as non-church-goers.

The Catholic Answers

Would you have them continue in their sins and discontinue going to Mass? That is what the average non-church-goer does. It would not be so bad if he did so and kept silent about others. But it is intolerable that he should rail at those who do attempt to offer some worship to God.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty