Without that, we have no anchor, and so psychological principles change regularly as the leaders of the field "learn more" about how they were previously mistaken (and then wipe their hands clean of the damage done to innocent people by their incorrect teachings, as they cover it up and move on). Saint Frances de Sales and Saint John Bosco were called masters of human psychology, and secular psychology is only now catching up to them in agreement.
Before we can get rid of negative problems in ourselves or others, we must first understand the nature of ourselves, and of the problems, because if we misunderstand these true natures, we're going to be remedying it the wrong way. And thinking of life or the mind as merely effects of the material world is already starting off on a bad principle, and leads to things like over medication, presuming that the mind can be fixed by changing things in the physical brain, which is really only a telephone by which the soul interacts with the physical world.
I know enlightened minds will scoff at these ideas, assuming religion to be for the ignorant, and maybe I am an ignorant fool, but anyone who agrees that there are absolute and objective truths will see clearly that the world is going insane. Parents proudly teaching their children that they can choose their gender, encouraging safe spaces where intellectual growth is supposed to be sought by mature young adults, grown men and women spending all their free time chasing every physical and mental pleasure as slaves of their passions without ever accomplishing anything of value, left wondering why they feel unfulfilled at the end of each wasted day.
Anyone who recognizes these truths and is frustrated by the world going in the wrong direction, especially with how it has been addressing (or rather enabling and encouraging) mental health issues, should not scoff at the ideas, principles, values, and beliefs that produced men and women who were willing to give up every good pleasure on earth for the honorable and noble goal of selflessly doing good for others in this life, that they may reap rewards for themselves and others in the next life. The Catholic Church has produced so many saints like Saint Benedict, Saint Francis of Assisi, Saint John Paul II, Saint Mother Theresa of Calcutta, and so many more that you'd do well to look further into what biases and inaccurate beliefs you have against its objective, intellectual, noble truths.