Just because the normal process isn’t parallelized like it was done for these vaccines, plus natural exposure to the pathogen usually takes a very long time to play out. As this vaccine researcher at children’s hospital of Pennsylvania notes, all reactions to vaccines that have ever been recorded were within 2 months of application. https://www.chop.edu/news/long-term-side-effects-covid-19-va...
If there is some long term disease that manifests from all this, I tell you what, people aren't going to care about "indemnified" big pharma. People will want blood.