Ok, but noone ever took responsibility on anything, except what's in the law. I mean, I've never witnessed anything like that.
Did Bush took responsibility when going to Afghanistan? Did Obama took responsibility when enacting ObamaCare? Did Trump took responsibility when embargoing Huawei? Did Raoult took responsibility when recommending Hydroxychloroquine?
I can go on. But really, if you want someone to take responsibility for something beyond laws and contracts (which implies compensation, a contract can't be one-sided. What you suggest would be one-sided), I think you're not in the right universe altogether.
How is this different than the state drafting people into the military, knowing that some of them will die?
In both cases, the state is obviously responsible for the outcomes. But that doesn't mean that there is a liability on the behalf of the state, or that you can hold an individual functionary working for the state responsible.
If the state is practically mandating you to be vaccinated for covid they (or the companies that make the vaccine) should be held responsible for anything that happens to you.
You can't have it both ways; either there are no distinctions between vaccinated and unvaccinated people (no measures that only affect unvaccinated people) or someone can be held responsible for any resulting disability or death.