I can't really even understand what this comment is trying to say. Vaccines aren't harmful. But doctors don't make vaccines, pharma companies do. And pharma companies would gladly hurt you. Conclusion: ???.
I think what is meant (from the post in question, not necessarily your summary): cui bono arguments are particularly ineffective for those claiming vaccines are harmful, because doctors, who generally consider vaccines to be very effective and mostly harmless, are not particularly financially vested in the continued use of vaccines (unlike the manufacturers, presumably.) If the use of vaccines was curtailed, doctors would arguably have more work.
Lets not put all vaccines into a sigle category. There are many different types of vaccines, from how they work to how they are actually manufactured, and they all carry different levels of risks. Blanket statements are not helpful.
There are extensive, multi-stage, rational, mandated procedures for not putting every candidate vaccine into a single category. Categorizations based on anecdotal evidence and superstition are not helpful.
>because doctors, who generally consider vaccines to be very effective and mostly harmless, are not particularly financially vested...
Interested does not always have to be financial. It is hard for a community to go back on its beliefs. So in all probability, it is possible that a doctor can ignore the negative effects of a vaccine they are seeing due to this and huge perceived peer pressure in talking against the current medical consensus (Which is, as stupid as it sounds, All vaccines are completely safe)
