There's a huge difference between accepting a situation that can't be changed, compared to a situation that is largely the outcome of awful decisions, especially where there are no technical reasons for failure, just human failure.
There are incurable diseases, where the damage is done and can't be undone, at least realistically given the limits of technology. On this, acceptance makes some sense, as long as there is adequate support. Which is almost never the case, but that's a different thing.
This doesn't apply here. Accepting the situation with ME is like accepting to have been wrongfully imprisoned and choosing to do nothing about it. This is largely a manufactured crisis, made worse by systemic dysfunction and incompetence. This cannot ever be accepted. Not everyone should carry the burden of fighting this, but it's an unacceptable situation, especially when the people pushing the acceptance are the ones doing the harm in the first place. Especially as they use the coercive acceptance of us being bullied into silence as evidence that they're "helping".
If AIDS patients had accepted that there was nothing worth doing, nothing would have happened. We are what happens when the patient population can't fight back, can simply be bullied into silence. Which obviously did not allow us to achieve more, if anything, it just keeps destroying generations of people.
We know for a fact that the damage is not permanent, that people can recover even after many years. It's a solvable problem that hasn't been solved by choice, and that's always unacceptable, especially when the decision to fail is made by other people with zero stake in the matter.