I am of the opinion that sedevacantists can't be condemned for their views because the Church has never condemned the sedevacante question. Several well known theologians have raised this question, and yet the Church never condemned them for doing so. The problem comes when some sedevacantists try to impose their consciences on others who do don't believe in sedevacantism. The conciliar Popes are suspect and I don't think it's wrong to have these suspicions.