Christina Taylor Green was 9 years old. Bright-eyed, optimistic and eager to learn about politics, she was simply on an outing to hear a local Tucson politician talk to her constituents.

On a pretty April day in 2007, Henry Lee was studying computer engineering at Virginia Tech University, still celebrating his newly attained American citizenship papers. He loved photography, movies and hanging out with his friends.

Lauren Townsend was captain of the girls’ varsity volleyball team and a candidate for valedictorian of the graduating class of Columbine High School. She was in the library with her friends, perhaps talking about where she’d attend college that fall.

Alan Beaven was preparing for a case in San Francisco and, after that, was planning a trip to India to do volunteer work. The young lawyer kissed his wife before he left on Flight 93 on Sept. 11, 2001.

These young people will never see their dreams materialize because they were all victims of murderous, evil madmen who killed innocents for reasons rational people can never understand, nor hope to.

Evil isn’t a new emotion. This raw, powerfully bitter emotion dates back to the days of Cain and Abel. Through the years, cold-blooded killers in positions of power have taken thousands of innocent lives — Stalin, Hitler, Idi Amin.

Even in my lifetime, there have been more senseless killings than I care to count. I remember vividly when our school principal opened the door to my second grade classroom in 1963 and, tears running down her face, told us all to get down on our knees and pray.

Our president, John F. Kennedy, had just been shot and killed.

Looking at the wall, it didn’t seem possible that the smiling, handsome young man in that black-and-white photo could be dead. Nor did it seem possible that five years later, we’d hear that the peaceable Dr. Martin Luther King Jr. had also been killed by an assassin’s bullet.

And, that same year, another murderer would open fire on the JFK’s young brother, Bobby, and senselessly end a life that promoted civil rights and an end to poverty.

These world leaders, and many whose lives were taken much too early in Columbine, Virginia Tech, Auschwitz, Uganda and thousands of cities and villages around the world, had dreams of building a brighter future.

They were filled with optimism and a dogged determination to make the world a better place. But those dreams were cut short, and there’s no good reason why.

In the aftermath of such tragedies, newspapers and the Internet are filled with thousands of words describing the psychological profiles of these murderers.

Pundits try to explain their motives — they were teased, they were outsiders, they were mentally unbalanced or they were angry at how their lives had turned out.

Instead of accepting personal responsibility for where they were in life or working to change the attitudes of those around them, these butchers used cowardly violence on innocent people. They took lives, shattered families and did their best to create an atmosphere of fear from coast to coast.

But if we let these murderers rob our country of hopes and aspirations that these young people and these young leaders believed in, then we’ve truly lost.

By concentrating too much on trying to figure out evil madmen, we run the risk of overlooking the heart and soul of what good people stand for.

Integrity. Attitude. Perseverance. Hope.

Martin, Bobby and Jack demanded that people incorporate those four words into their daily lives. In the deliberate acts of violence our country has experienced in the past few years, bystanders have stood up, used their bodies as shields and intervened as much as possible to stop the violence.

Few of us will have the split-second decision in that situation, but we can strive to be brave and accepting every day of our lives through our words and actions that tell the world we’ll never stop hoping for peace.

Christina, Henry, Alan and Lauren would be proud.

This column was originally published in The Fort Bend Herald.