If it were 90% of the deaths occurred within 24 hours, would you be concerned about the safety of these vaccines?
Not if that was the only indicator. VAERS is completely self reported and as such subject to all kinds of biases.
Plus, every death reported to VAERS is investigated by the CDC and FDA. To date they've only identified nine that they feel were caused by the vaccines, and they were all J&J.
What would concern me? If there was evidence of more adverse events in the vaccinated than in a similar population of the unvaccinated. I've seen no evidence of that.
It would also be a red flag if we saw a significant increase in the rate of these events since Covid vaccinations started, but I haven't seen that either.