@ParaParaYukiko from experience, nothing you could have said would have made a difference there, my friend. Some things are beyond the realms of reason.
The few times I have not spoken when I should, I have been able to do something about that again, and have made the point of somehow putting it right if it was truly important. The many times I have spoken words I shouldn’t have, cannot be taken back. I am truly sorry for the times where this has caused hurt to others, and have felt deep pain myself at the realisation.
Whilst life is too short for regrets in terms of taking chances and decisions made, there are things I regret saying and hurt I regret causing, and I’m okay with that. It is harder to undo things said, than to create another opportunity to say the right thing. It’s having the balls to do either, and to hold yourself accountable for the outcomes of your deeds.