I can 100% understand antivaxers to be fully honest. We all know that drug companies do lie to us constantly and the FDA is completely regulatory captured. Why wouldn't you be skeptical?
Also... We know the government used to sell weapons to terrorists and right wing governments in central America and got paid in drugs, which they sold in the US. They do this stuff constantly. So if we found out that 9/11 was actually an inside job after all, i would be like... Yeah that makes sense. That seems like something they'd do.