I would never sign a DNR. It’s just an excuse for the hospital to let you die.
They tried to get us to sign one for my FIL. After they gave up, he got the simple antibiotic treatment that let him live another 2 years.
You don't understand....that is obvious.
I’m a long time nurse. It has been my experience that you are right about this at least some of the time. Sometimes people are surprisingly ready to die however and they truly don’t want any “heroic measures”. I guarantee you that I don’t ever look for an excuse to let someone die but many doctors are quick to walk into the room with a blank DNR form and they can be pushy about it. It’s best to figure it all out before you get to the ER and find yourself unable to communicate your wishes, have it all in writing and on file with your usual hospital.