There is a common trend towards trying to accept everything in the world. To allow it. To give it permission. To let it be whatever way it is.
There is one part of this which is beneficial. If you resist things, you make them real. If you control things, you make them real. If you judge and attack things, you make them real. It would imply that if you accept them "as they are", you can find some kind of peace, where you're not really attached to outcomes or conditions or situations or people. As if the world will just fluidly flow over your experience without triggering anything or upsetting you. Because you accept it. But this also can be a trap, and a massive justification for keeping suffering and death.
Because the fact is that this world is not real. It's an illusion, and everything in it is a lie. It's not supposed to be happening. It's not natural. Whatever you accept into your mind you make real to you. If you accept the world into your mind, you make it real. If you are in a position of "allowing" it, you are handing over causality and permission and power to it. If you are trying to simply be at peace with whatever happens, you are not owning the fact that you are making everything happen. If you focus on trying to transcend whatever's going on, which can bring a sense of peace, it does not necessarily bring into question whether things are happening or not.
The task at hand is more to do with learning to recognize that this world is NOT happening. There is not anything to really ACCEPT about it because it isn't really doing anything. You don't have to ADJUST TO conditions, or try to persuade yourself to be okay with suffering, sickness, unhappiness and death. You're not supposed to be having any of these things.
The only true acceptance, the only thing you should ever accept, and thus believe in fully, is THE ATONEMENT. God's truth. Reality. This world is not reality. In accepting the atonement you are accepting something that should be accepted. Something which will bring a cure. Something which will instill miracle mindedness and the ability to be invulnerable. Something which puts you in touch with the power of God, to have dominion over this fake world.
There is merit in not being in such a 'fight' with the world, not resisting it or taking sides against it or having this whole ego un-peaceful counter-attack scenario in your mind. Yes, so it's good to accept things on that basis, because it at least includes less conflict mentally. BUT, this also should not be on a basis that "the world is real" and "things are really happening" and "bodies are really sick" and so on. You should not be accepting that these things are true. You should not be "allowing" them as such. Otherwise you become a passive, miracle-less fence sitter with no power to do anything.
Detaching from the world is great. But it must include the *recognition* that the world is not real, it is entirely illusory, you should be not "agreeing with" it, you should not be justifying it, and you should not be confusing acceptance with authorizing death. It may seem paradoxical but accepting the TRUTH should entail the DENIAL OF the world, the rejection of death, and a demonstration of symbolic immortality in the body.
You are not supposed to just find a way to "let the world happen", you're supposed to become aware you are DREAMING IT and MAKING IT happen, and thus regain power OVER it to change it at will. That's a massively different position than merely trying to get comfortable with "real suffering" or "whatever happens that I did not cause." There is no causality in that kind of acceptance, it's a total passivity. Yes you can try to accept that you feel unhappy but you shouldn't be feeling unhappy. You can try to accept your body is sick but it is not supposed to be sick. Are you going to accept your death?
You might think well, if I am so at peace and accepting of what's SEEMING to happen in this illusory world, why would I bother changing it? Because if the body is sick, the mind is STILL sick. The body can't get healthy unless the mind is healthy. And the mind cannot get healthy while the body is being constantly bombarded with mind attack. "A broken body IS PROOF the MIND HAS NOT BEEN HEALED." So the body DOES have to get healed as well, which means the reversal of sickness and death. Death has to get UNDONE, not accepted. Otherwise there is no true resurrection of mind OR body.
ACIM does not teach to "accept everything that happens in a dream world". It teaches there IS no dream world and YOU are the dreamer who makes it be whatever you decide it is. And if you change your mind, THE WHOLE WORLD MUST CHANGE. This is a course in CAUSE, not being passive. "Members of my party are ACTIVE workers." Will you lay down and let death happen against your will, and try to "accept it"? You cannot be at peace with death. Death can only "happen" if you CONSENT to it, which means you CAUSE it, because you have an attacking unhealed mind that's not at peace.
If you want people, you must learn to undo the world and stop dreaming of nightmares. Not because otherwise you'd be at the effect of external causes of un-peace but because being at peace goes hand in hand with HAVING POWER AND BEING THE CAUSE.