In other words, no cut and paste answer to automatically believe because it has 'Dogma' stamped on it. If there were any scripture, you wouldn't have this mess. But there is none and scripture rules out the possibility of a purgatory. Therefore, you'll have to wait on them to find a way to draft it in philosophical arguments and hope they know what they are talking about. If it sounds right, they'll try it on the masses, it then becomes tradition and if people believe it, it must be right. Enter the Clergy to stamp it official and make it dogma, then it's all clear because it has an official stamp and somebody buys it. God can give you answers all day long. Why can't the RCC?
Canon V: If any one saith, that baptism is free, that is, not necessary unto salvation: let him be anathema (The Canons and Decrees of the Council of Trent. Found in Philip Schaff, The Creeds of Christendom (New York: Harper, 1877), Decree on Justification, Chapter IV, p. 91; Canons on Baptism II, V; pp. 122-123).
Not surprising, but still amazing.
Pope Boniface VIII (1302 A.D.)
So, when the Greeks and others say that they were not committed to the care of Peter and his successors, they must confess that they are not of Christ’s sheep, even as the Lord says in John, ‘There is one fold and one shepherd’... Furthermore, that every human creature is subject to the Roman pontiff,—this we declare, say, define, and pronounce to be altogether necessary to salvation (From the Bull Unam Sanctam. Found in Philip Schaff, History of the Christian Church (Grand Rapids: Eerdmans, 1910), Volume VI, pp. 25-27).
The only part he got right was the "bull" part. That's what it is.