You should feel bad for giving advice that can kill. You should not feel bad for correcting that bad advice and potentially saving lives.
Trust me. It’s my day job to make decisions where the wrong one can result in deaths. If you don’t feel bad when you inevitably make such a mistake, you are a sociopath and need to be told as much.
Besides the only reason I brought up my opinion of how he should feel is he tried to say I was attacking him, which at no point have I done.