There’s been an element of ‘thinkers’ in the last couple of decades trying to make a differentiation between sins as ‘mortal, grave, and venial’ with the idea that a sin of objective grave matter doesn’t meet the criteria for mortal sin it isn’t mortal sin if the other 2 criteria aren’t met.
And the main thrust along with is usually that people cannot POSSIBLY FULLY KNOW anything, therefore --even if it’s grave matter, it’s not a mortal sin!
Or the person cannot POSSIBLY FULLY CONSENT --there is always some factor, psychological or emotional or societal or coercive --so even if it’s grave matter, it’s not a mortal sin!!
It’s not really the grave matter that’s a problem. People have known since day 1 that three conditions are necessary. However, in modern society there’s been a systematic push to eliminate as much knowledge as possible to start with (witness the abysmal state of catechesis) and couple it with a push to surround people with pills and pressure and medical ‘diagnoses’ etc. in order to weaken them physically, emotionally, and spiritually, to help with exactly this kind of situation. Now they are trying to lessen the grave, and since there is no way of saying something evil is not objectively evil, the push is to make it not evil due to SITUATION, and to package it in Catholic terms and rely on fuzzy feelings, ambiguity, and the above-mentioned longstanding destructions of knowledge, truth, virtue, etc. to push this into something that LOOKS doctrinal but isn’t.