Ibuprofen reaches a threshold of toxicity; a level at which our body's ability to manage it gets met and then exceeded. Things go rapidly wrong at that point.
Degraded mRNA just... doesn't work. It'd be a problem if all the mRNA in your cells started suddenly degrading faster than usual, for sure, but that's because you need the resulting protein output to live. If the vaccine degrades too fast, it just doesn't produce the proteins it was supposed to, but we didn't need them to function. Lost efficacy, but you don't wind up growing extra arms.
Ibuprofen reaches a threshold of toxicity; a level at which our body's ability to manage it gets met and then exceeded. Things go rapidly wrong at that point.
Degraded mRNA just... doesn't work. It'd be a problem if all the mRNA in your cells started suddenly degrading faster than usual, for sure, but that's because you need the resulting protein output to live. If the vaccine degrades too fast, it just doesn't produce the proteins it was supposed to, but we didn't need them to function. Lost efficacy, but you don't wind up growing extra arms.