It's only being careful if you're immunocompromised in some way that would make the vaccine actually dangerous, which is even rarer than side effects being more than soreness.

COVID isn't a well known virus. The fact that it destroys the nerves between your nose and tongue and your brain is a HUGE red flag that should be terrifying to everyone. Nerves are very similar throughout the body, and we don't know the full extent of damage caused by it yet. Chronic Fatigue Syndrome, which may or may not be the same thing as long COVID considering it is generally caused by various viral infections, is incredibly not well known, but affects far less people supposedly. Maybe the fact that 25% estimated last I checked of people get at a minimum mild long COVID symptoms, and 10% of those never really recover, with most people reporting lowered energy levels permanently (not like enough to be a disability for most) will help drive more research, as there's a lot of cases of COVID permanently screwing over perfectly healthy people.

I mention here one of the least devastating aspects of ME/CFS and similarly long COVID which share a lot of symptoms. There are people who cannot stand up without assistance because of them. People have lost jobs due to them. And in America, not having a job means not having decent healthcare or any sort of benefits.

Being careful means getting the damn vaccine if you can, when you can, as soon as your doctor tells you that you are healthy enough to do so, every single time. If not for you, then for anyone you care about. Care about human life, get the vaccine.