It's bad to waste medical resources on a minor scratch.
Jane falls and scrapes her knee while skateboarding and causes it to bleed.
Jane wants her knee to stop bleeding and be cleaned up.
Jane washes her scrape with water and puts a bandage on it herself.
Jane calls 911 for an ambulance to come help her.
A person having a heart attack gets helped right away and makes it to the hospital quickly.
A person having a heart attack has his heart become weaker as he waits for an available ambulance.