"SSPX is already very much like the CPC in that both are institutions of the excommunicated."
Why then are so many Catholic dioceses in the U.S. giving faculties to visiting CPC padres?
Let us further not ignore that Red China is a totalitarian state. The United States is not. Nor is England. Nor, whatever their drawbacks as nations, are most (all?) countries where SSPX dips its excommunicated toe. It is said that married men were ordained in Czechslovakia during the communist era there and required to retire as priests when fredom re-emerged.
SSPX is a schismatic, excommunicated evil. Like most of us tell our kids: the sins of others do not justify yours. Likewise, SSPX's arguments from imagined moral equivalency do and ought to fall on deaf ears.
Which dioceses and priests have you in mind that harbor CPC priests? Which bishops preside over this? I have heard that some CPCs study in the Vatican but will not presume the reason why the Vatican allows it. Hopefully it is the fine Roman hand. There are none in Rockford and none are likely while Bishop Doran draws breath.