Everyone who is able should understand the basics of first aid. As many as possible should consider getting trained and certified in first aid/CPR and AED. Nearly all public places, airplanes, and large stores now have AEDs. Their use is responsible each year for saving many lives. They are easy to use but require a little training.
Whether and when to give assistance is a personal decision based on many factors. But you can't do it if you don't know how, even for a loved one.
If you want to shoot...shoot...don't talk! Tuco
USAF Munitions 1969-1992