yesthey are.
CPR can't resuscitate a heart attack victim, it's designed to push air back into the lungs, but at least you tried to help. Unless you cracked his sternum, in which case you probably didn't do much helping but it's the thought that counts.
If you aren't certified in CPR, prepare to be sued. Also if someone hit you and you hit someone else as a result you have to pay for the damages of the car you hit, and the guy that hit you has to pay for your damages.