Based on the letter to the Australian (?) posted above from the Vatican congregation, I think your conclusion is unwarranted.
The Vatican WARNS that regular attendance at schismatic Masses is 'harmful to your health,' but did not seem to impose penalty of sin.
"'indicate that though assistance, per se, isn't schismatic, it is generally gravely sinful,'
"Based on the letter to the Australian (?) posted above from the Vatican congregation, I think your conclusion is unwarranted.
"The Vatican WARNS that regular attendance at schismatic Masses is 'harmful to your health,' but did not seem to impose penalty of sin."
Ninenot, let me first clarify what I said. I can't impute moral culpability to anyone. I don't know who is personally, subjectively guilty of sin, even if I can see that they have committed an act which is the matter of serious sin. So, I can't say who is morally culpable of sin of those who assist at illicit schismatic SSPX Masses.
But I can say that such assistance is generally the matter of grave sin. In fact, a relevant document has already been quoted. Please refer to post 291 by patent, to the final letter from the commission Ecclesia Dei, the paragraph numbered as #2. I've excerpted it for you:
"2. The Masses they celebrate are also valid, but it is considered morally illicit for the faithful to participate in these Masses unless they are physically or morally impeded from participating in a Mass celebrated by a Catholic priest in good standing (cf. Code of Canon Law, canon 844.2). The fact of not being able to assist at the celebration of the so-called 'Tridentine' Mass is not considered a sufficient motive for attending such Masses."
A morally illicit act is an act which is objectively against the moral law, which is one way to define "sin".
Now, I'm sure that the schismatics will play their little mental evasions and say that they are impeded from attending a licit Mass, and thus, can attend a schismatic Mass. * sigh * Why bother disputing with them? They will deny the licitness of the Mass of Pope Paul VI, and thus vitiate the above command. They are so caught up in their own moral evasions, that they have entirely discounted the irrefutable postings of patent and others showing them their sin. Perhaps they are invincibly ignorant. One can hope.
But clearly, assisting at an illicit Mass is generally morally illicit. One effect of assisting at an illicit Mass on Sunday instead of a licit Mass is that one has, generally speaking, not fulfilled one's Sunday obligation. That is a matter of grave sin, not merely venial.
Again, I can't say who is or isn't personally, subjectively culpable of mortal sin, but assistance at an SSPX Mass is generally a matter of grave evil, and full culpability of the offense would constitute mortal sin.
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