I have a different attitude, so I thought I'd throw it in for people to ponder.....
What about when you can see that someone has a serious illness, but can be saved if they act fast, but will kill them if not? Do you tell them then, and just not attach yourself to the outcome, or try not to?
What if you pick up that someone is about to commit suicide? Do you tell one of their close family members?
What if you see clearly that a good friend is developing the same dementia that killed both her parents? Early intervention can slow it way down for many people. Do you keep quiet?
I've been in all of the above situations, felt like you all did, and kept my mouth shut in the first two cases. Both people died just as I'd foreseen, and I've never forgiven myself, so my policy after that has been to speak up. I do not care if they think I'm nuts, if they end the relationship with me, if they bad mouth me, etc. I feel I have to.
The third example happened after this change in policy, and speaking up thus ended my longest and closest friendship, since she took my caringly expressed request that she be evaluated by her doctor as an "accusation" of having it for sure, and a lack of accepting her as she was, such inappropriate anger and denial being a sign of dementia also.
You are correct many people do not want to hear. I've lost other friends over this. I just can't live with myself if I do not say something. The deaths of those two people who changed my mind about speaking up will haunt me forever. The wife of the suicide told me he was stubborn and nobody would have talked him out of it, when I told her what I'd seen after his death. However, the woman in the first example was spiritual and open to such abilities. I had just met her and was afraid she would think I was nuts if I told her I thought she had liver cancer. Now I don't care what anyone thinks.
I also find telling people to be a good way to root out liars in your social circle. I had one long time friend panic when I told her, insist I was not an empath but a sympath, though she knew nothing about such subjects, and distance herself, all because she was afraid I'd pick up all the lies she'd told and the selfish acts she was ashamed of. I'd already picked those up long ago and accepted them, but she couldn't deal with her act being found out.
Isn't there anyone like me who feels we get such info on purpose to help and must use it?
I know the price can be high, since I miss my old friend every day, but the price for not talking is higher, at least for me.