I recall reading in the book, "Band of Brothers". The surviving members of Easy Company said they they took much more risk their first few days in combat than they would later. In a short period of time those who survived learned that minimizing risk was the key to survival.

It seems like a no brainer, but as young men new to the situation, they didn't truly realize that they could be killed. It didn't take long before they understood that they were in a situation that they would be lucky to survive.

After that they stopped taking unnecessary risks.

Same with domestic shooting situations. If you choose to engage the shooter, you better have a good plan that minimizes your risk or you're just going to die.