The fact is we have no clue about the long term effects of the vaccine.
there was no way zantac 75, an otc heartburn medicine around my whole life could cause cancer, till decades later and they found out it was very much causing cancer, hence the commercials you see every 15 mins.
We also don’t know the long term effects of Splenda, wifi, cell phones, beyond meat, and dozens of other things we put into or around our bodies. That’s just life.