That desire, in retrospect, appears as heartfelt as it does disturbing.
Karr is a man who, while wanted as a fugitive on child pornography charges, sought to impress prospective employers with a long record of accomplishment preparing young lives "for a successful future."
He is a man who twice married teenagers — one just 13 at the time. Both would later claim they had been coerced.
And he is the man who years ago confided to family members that he was deeply troubled by the murder of the Colorado 6-year-old, who he now claims to have loved and sexually assaulted.
It's difficult to know how much to believe of the life Karr, who is 41, says he has led since JonBenet was found strangled and beaten a decade ago in the basement of her family's home.
But in his own words, it all seems quite real.
"I awoke the children in the morning and gave them breakfast," Karr wrote in one online resume, recounting life as a private teacher and caregiver of three girls in Germany, aged 7, 11 and 12. "At day's end, I made sure the children had their evening bath, then put them to bed and read to them before they went to sleep."
Karr, who arrived in Thailand earlier this year looking for work as a teacher, claims to have spent years skipping from job to job, country to country, nearly all the time working with children. Details proved difficult to pin down Thursday.
School officials in Alabama and California confirmed that he worked in both states as a substitute teacher in the latter half of the 1990s and in 2001.
"He just seemed like somebody who thought he wanted to be a teacher," said Bob Raines, superintendent and principal at Wilson Elementary School, in one of the four districts near Petaluma, Calif. where Karr worked. "After a few days, I could tell it just wasn't for him."
One of Karr's former wives, Lara Karr, told KGO-TV in California that her ex-husband spent a lot of time studying the cases of Ramsey and Polly Klaas, who was abducted from her Petaluma, Calif., home and slain in 1993.
Lara Karr said she was with her former husband in Alabama at the time of JonBenet's killing and she does not believe he was involved in the homicide.
Some experts raised questions Thursday about Karr's arrest, noting that some details of his alleged confession seem out of line with circumstances of the case, and pointing to the need to establish evidence putting him at the scene.
But it is not easy to establish his whereabouts at any point in recent years.
Karr is remembered in his hometown of Hamilton, Ala., as a smart kid, one who played in the high school band and matured into something of a local curiosity.
"You couldn't help but like John. He always had something going on," said Marion County School Superintendent Bravell Jackson, who recalls teaching Karr in elementary school and driving the school bus Karr rode.
As an adult, Karr wrote in one online resume that he worked for years in real estate and restored old homes. His work in schools appears to have begun in 1996 — the year of the Ramsey murder. According to the resume, that was the start of a five-year stint teaching in "some of the most prestigious schools in the United States, working with children from high profile families."
But that is not the way people and court paperwork in Marion County recall it.
In 1984, when Karr was 19, he married a local girl, Quientana Shotts, who was 13 at the time, county court records show. Shotts filed for an annulment the following year, complaining that she was "fearful for her life and safety." In a response filed with the court, Karr contested Shotts' age, saying she was in fact 14.
In 1989, Karr remarried, this time to Lara Knutson. She was 16 at the time.
Contrary to his resume's description of a life in the classroom, Karr's sole Alabama experience was being hired as a substitute teacher in 1996. But his time there ended after school officials received complaints about Karr saying things "that didn't need to be said in an elementary class," Jackson said. Karr was "bragging on the students, their dress," said Jackson, declining to elaborate further.