Funny the article doesn't talk about the specific schools with the problem, where they are located, and the demographics.
The answer is probably to be found in the maps found here. Scroll down to the section "Map of Race and Ethnicity by Tract in Tulsa" and click around.
So all in OK is not O.K.
Thuggish behavior way down at the K & Pre-K level is nothing new, at least for NYC. I have friends teaching el-ed and I hear many stories of filthy language, very violent behavior, sexual behavior, hitting the teacher, etc. in pre-K and classes of very early grades. I was once sitting in an orthopedist's office many years ago, to be treated for bursitis. The woman sitting next to me was covered in casts on several limbs.
"Oh dear, what happened? Were you in an auto accident?" I asked.
"No," she replied. "I'm an elementary school teacher and I was attacked by a student."
Wow.
Interesting charts. Thanks.