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It's not a question of a "main narrative" - it's a question of what has scientific evidence behind it. Trust me, if there's evidence for something working against COVID-19, the "main narrative" will absorb it with pleasure. Conversely, it's not helpful to tout treatments that have no evidence for working - or worse, may be actively harmful.
Anything is possible - but anybody claiming absolute facts about long-term immunity for a virus that's been known about for <6 months is full of bull manure.
In fact that kind of certainty is a reliable guarantee that you're not talking about a credible scientist but someone with an ulterior motive. Science just doesn't work in certainties like that, and right now the immunity question is perhaps the biggest uncertainty about SARS2. As you say we get some good immunity from similar viruses for a few months, and weaker immunity after that - but it's simply too soon to tell with this new virus. Anything is possible, but for now the working assumption has to be that it's something similar to flu or original SARS. But if anything, the thought tends to be that we'll have less immunity than some kind of invincible eternal immunity. The Lancet talks about this at a high level, Wired's done a good article or see this from the MIT Tech Review :
"They found that people frequently got reinfected with the same coronavirus, even in the same year, and sometimes more than once. Over a year and a half, a dozen of the volunteers tested positive two or three times for the same virus, in one case with just four weeks between positive results. That’s a stark difference from the pattern with infections like measles or chicken pox, where people who recover can expect to be immune for life. For the coronaviruses “immunity seems to wane quickly,”...it’s not even known, for instance, whether the common coronaviruses mutate in ways that let them evade the immune system, or whether there are other reasons immunity is so short-lived....I don’t know when this goes away, and if anyone says they know, they don’t know what they are talking about”"
Cytokine storm - it's a common mechanism of how viruses kill, and does seem to be an important part of the Covid story - see this good review of Covid disease (less specialist summary here) The antivaxxers love to conflate this with some of the responses to vaccines. Obviously they tend to omit the fact that the BCG vaccine seems to give some general protection against viruses as that doesn't fit their agenda.
But the basic premise is false - it's easy to find out the death rate in the US military - on 22 April it stood at 25 or 4% mortality, lower than the 5% average of the US. Also the front-line troops (more likely to take fancy vaccines) are less likely to die than bureaucrats in the Pentagon.
That's not to say there may not be unexpected interactions with military vaccines - but at first sight there doesn't seem to be a strong effect. If there's hard evidence, let's see it.
No there isn't. There seems to be a bit of evidence that hydroxychloroquine stops these viruses in the lab, but it needs such high doses in humans that the side-effects outweigh any benefits. For instance
The use of the anti-malarial drug chloroquine to treat COVID-19 patients has been halted at several Swedish hospitals due to reported side effects such as cramps and loss of peripheral vision.
Death rate was 27.8% in former US soldiers given hydroxychloroquine and 11.4% without hydroxychloroquine.
A trial was halted because the hydroxychloroquine people were dying : "The preliminary findings from the CloroCovid-19 trial suggest that higher dosage of chloroquine should not be recommended for the treatment of severe COVID-19, especially among patients also receiving azithromycin and oseltamivir, because of safety concerns regarding QTc interval prolongation and increased lethality. "
If there's hard evidence (and not just anecdote) that this stuff works, it should be easy to find a proper clinical trial showing efficacy.
I know everyone is desperate to find something that reduces the death rate - but taking random drugs that have dangerous side-effects is not the way to do it, not until the benefits and risks can be better quantified. And bear in mind that most people with Covid do recover, regardless of whether they took hydroxychloroquine or not.
