I think this is analagous to ME patients who go out to get antivirals because they are sure the viruses are the cause, but don't get better with them.
Do you understand how antivirals work? They slow replication, they do not kill the virus. You are still dependent on your immune system to kill the virus-infected cells. If your immune system is doing a very poor job of killing the virus, which is quite possible with immune dysfunction, then you must rely on the natural die-off of the infected cells, which can take a very long time if the virus is continuing to replicate, although more slowly than it would without AVs So it's possible people don't get better rapidly with AVs even if a persisting virus is the cause. Those people could be perfectly correct that they still have virally-infected cells (and symptoms) after fairly long treatment with AVs.
For the record, I think viruses are a major factor in my illness and cause a number of the symptoms. In my case, AVs improve my condition significantly, but do not cure my ME. I didn't expect them to. I expect them to keep the viruses latent, or (in cases of different types of viruses) eliminate the infection until I encounter it again. Before you jump on me about antibodies, let me remind you that not everyone with immune dysfunction has an adequate antibody response to all infections.
So I'm not one of those you look down your nose at "who go out to get antivirals because they are sure the viruses are the cause, but don't get better with them", but I don't dismiss their experience out of hand. I see a legitimate way their experience could be just as they describe. It's not my experience, but that doesn't mean they're wrong about what they understand about their symptoms and their tests.
IMO, the viruses I'm continually fighting are not the cause of ME itself. They mostly likely are, however, the cause of some of the most difficult symptoms, so taking AVs improves my condition significantly.
Try to distinguish between the root cause of ME and the multiple causes of the multitude of symptoms PWME suffer from. They are NOT the same thing. Not everyone who thinks treating infections is important thinks that the infections are the root cause of ME. Most don't, from what I'm hearing. They're intelligent people who understand that treating the cause of symptoms is not necessarily treating the root cause of ME, and know that treating treatable conditions can vastly improve QOL in ME without effecting a 100% cure.