It is just a fringe conspiracy theory. Most of the tales of people injured or killed "from taking the vaccines" hold just as much water as the inflated COVID death statistics that included people who died from falling off a ladder, or died at age 98 in a nursing home where they'd been on hospice status form months, and just happened to have tested positive for COVID. Sure there are going to be a handful of people who have an unusual allergic reaction. Peanuts kill a few people every year too, but we don't start campaigning to take peanuts off the market as "too dangerous".