Why are some people so ungrateful to be living or the fact their life was saved?

We had a guy one of our cooks overdose and pass out in the kitchen. One of the waiters told me to call 911 while some of the kitchen staff were working on him to get him to breathe. When the fire department and ambulance arrived, they Narcaned him back. But after learning what happened he turns out he was refusing to go to the hospital and was mad we called 911 on him and saved his life. The dude was dead for a few minutes he was literally blue and black. If that was me I would be greatful I got another chance at life.

Why are some people so ungrateful to be living or the fact their life was saved?
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