It actually just doesn't stay in the blood for as long and the toxicological effects of ethyl mercury haven't really been studied very well. A paper looking at ethyl (the kind from thimerosal breakdown) and methyl mercury poisoning in baby monkeys found much greater inorganic mercury buildup in the brain from ethyl mercury during the sacrificial autopsies, both in absolute and relative terms. There's not been a longitudinal study about ethyl mercury in humans, so I really don't know how you can be so sure about this. The vaccination schedule undergone by infants regularly exceeded the EPA's blood-mercury limits by up to 10x until as recently as 1999. Nobody has ever been investigated, nor have damages been allowed to be sought in court. If this was any other medicine we'd be able to have a level headed conversation about it, but because it's vaccines everybody gets really fucking hyper abt it. BTW I'm fully vaccinated and recommend vaccination for evrybody who is physically able. Not a doctor by any means, and would be very interested in learning more about the scientific literature on this subject as I'll be the first to admit my knowledge is shallow.

https://www.sciencedirect.com/science/article/abs/pii/S1382668919301875

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1280342/