I tried to help sick wild pigeon but end up killing it.

Read about some warming up birds wrapped in a piece of newspaper on central heating, was for parakeets but guess would work on bigger ones too.

Don't feel too bad. At least you tried to help.

Well now it can definitely be a roasted wild pigeon! You've already salted it.
Kidding of course. :P You tried your best, and if it died I'm sure the bird definitely would have been grateful to you for getting those awful things off it.

Why not taking the pigeon to the vet?

You learned something and it also could be that the pigeon had other but internal issues that you were unaware of or it could have gone in shock by stress or temperature difference.

You are definitely the good guy here, since you tried to help. I think most people would have ignored the pigeon. From what you are writing its chances of survival were minimal to begin with, so no hard feelings!

Don't feel bad. Removing parasites is a good thing but it was obviously very sick when you found it.

I think you did the right thing, but I would call a vet over if possible.

We can't know or predict everything. Thank you for trying.

I know it must feel bad but you tried to help and that counts too.

Nah, you did good. Caring for animals is a good banner to carry.

I already managed to save birds. But I've also failed at some other times. I hope you can save on another opportunity!

As others have said, you tried to help and that counts. From my experience with saving wild animals, most of the time they die no matter how much you try to save them. Rest in peace my buddy

I remember trying to save a pigeon I found after a pretty bad blizzard when I was a teen. He was trembling with cold and he was already pretty weak. The little guy didn't make it either and I was devastated. You get points in my book for trying though.