I am not convinced that terrain theory makes sense without germ theory, I think it's some mix of the two. Things spread in a way that is far too coincidental for germ theory & virology to not have some validity. But I do understand & agree that there is a lot to question about virology beyond just the adjuvants in vaccines. Some vaccines do actually work to protect against the viruses they are designed to protect us from though, they just aren't worth the long term health consequences. The body doesn't care about dead viruses, so you have to inject something with it that is worse than any virus in order to initiate an immune response.