"Some" are the modernists. Especially well versed and learned men, even theologians, who adhere themselves to erroneous ideas such as rationalism, relativism, pantheism, materialism, etc. and want to reduce to a minimum the meaning of dogmas in order to satisfy the world's modern needs. They think Catholic heavenly dogmas may be expressed in terms affined to current human systems.
They reduce EENS to a meaningless formula when they make it possible salvation for non-Catholics. "The Mystical Body of Christ and the Roman Catholic Church are one and the same thing". There is an absolute necessity of belonging to the true Church in order to be saved.