But Trent literally says this. That the Rites of the Church cannot be harmful.
I am not sure what you are talking about, is it this canon?
CANON XIII.-If any one saith, that the received and approved rites of the Catholic Church, wont to be used in the solemn administration of the sacraments, may be contemned, or without sin be omitted at pleasure by the ministers, or be changed, by every pastor of the churches, into other new ones; let him be anathema.