My comments were really just observations, rather than an attempt to propagate a conspiracy theory.
Issues that can be identified that might lend support to conspiracy theories typically have other, more easily understood, explanations.
1. People are not rational. We use reason as a tool. Reason is limited by what we know, including the things we know that are wrong. What we do not know can change the reasoning. This is very very important. When we discover someone doing something irrational, sometimes we think they have an agenda. More usually its just ignorance and bias.
2. Companies and organizations that do the wrong things are operating on incomplete knowledge, and often to legitimate agendas. The are mandated to work in the interest of their organization, not society. It is government's role to provide the balance. Sadly, governments worldwide are failing, badly, on this issue.
3. There is mutual reinforcement based on agendas of individuals, organizations etc. Political and financial support can flow from this. Its not conspiracy, its business as usual. In this case, business as usual that harms society. When this happens to generate research its called Zombie Science.
4. There is bias from financial and reputational reinforcement. If bad behaviour is reinforced, whether it be from organizations, researchers or doctors, then its easier to go down that path. This is not corruption, exactly, but this bias can severely distort the agenda and conclusions drawn.
This does not mean conspiracies do not exist. There is a famous quote I couldn't be bothered looking up that goes something like this: put any two people into a room by themselves and you can have a conspiracy.
There is also no doubt at least a few large insurance companies are working hard to change public perception on how to deal with chronic disease or disability. They are exerting political and financial influence. Yet sound data showing their claims are right does not seem to exist.