Often, apathy has been felt after witnessing horrific acts, such as the killing or maiming of people during a war.

He claims to have witnessed atrocious acts of aggression and slaughter.

But in other answers, some soldiers acknowledged having witnessed acts of abuse or maltreatment.

The earliest humans ran for their lives, witnessed acts of violence and lost the people closest to them in traumatic circumstances.

While his duty did not include combat, he claims to have witnessed acts of war between Chinese and Japanese soldiers.

While in detention, he witnessed horrific acts of torture-experiences that haunt him to this day.

Thousands of years later I had witnessed other acts of brutality.

Yet it is achingly difficult to leave behind the place where you witnessed such stubborn, defiant acts.

Mankind has been witnessing acts of violence against the Palestinians for several years now.

How many people have really witnessed, in person, violent acts in their lifetimes?