For all we know, it might be a cumulative effect or latent effect where whatever the damage these vaccines are supposed to do are not obvious until it's too late (i.e. 4th shot by when they've had plenty of time to tell people "see it's all safe").
I've been using the analogy that you're playing Russian roulette every time you take one of the vax shots.
I've been using the analogy that you're playing Russian roulette every time you take one of the vax shots.