I usually tend to try and avoid these sort of debates as it's the equivalent of banging your head against a brick wall but a bit of balance is sometimes necessary.
I read a very interesting piece in the NY Times who were interviewing the Head of Vaccine Research at the University of Alabama - he pointed out that with decades of vaccine history plus data from around 3 billion doses administered to people starting last December — there is powerful proof that there is little chance that any new dangers will emerge from COVID vaccines.
Unlike many medications which are taken daily, vaccines are generally administered on a one-off or irregular basis. Medicines you take every day can cause side effects that reveal themselves over time, including long-term problems as levels of the drug build up in the body over months and years. I'll quote the good Dr Goepfert directly:
“Vaccines are just designed to deliver a payload and then are quickly eliminated by the body. This is particularly true of the mRNA vaccines. mRNA degrades incredibly rapidly. You wouldn’t expect any of these vaccines to have any long-term side effects. And in fact, this has never occurred with any vaccine.”
He has also pointed out that there have been initial problems but these have appeared soon after the widespread use of the vaccine began but the rare side effects identified with COVID vaccines have to be weighed against the known, higher risks from contracting COVID itself.
I appreciate this isn't going to change the minds of anti-vaxxers and defenders of personal liberty but it makes the more rational of us feel a little better.