Why Isn't This A Hate Crime?

From WNEP, PA.: Three teenaged boys are accused of shooting a pet donkey on the farm of an Amish family in Lycoming County.
The boys were charged Thursday, about a week after the donkey was killed.
The donkey’s owners are devastated. They said “Eeyore” was their family pet. Their children would take turns riding him and all the neighborhood children pet him on their way to school.
According to state police, three teenagers shot Eeyore six times, last week killing the donkey.
Amos Yoder and his family live on the farm near Montgomery. The Amish family has a lot of animals, but they said that Eeyore the donkey was their children’s pet.
On Thursday three teenagers from Montgomery admitted to the crime and were charged with cruelty to animals and possession of a firearm by a minor. Two of the boys are 15, and one is 16.
According to investigators, the teens used a gun similar to a .22 caliber Crickett with a scope.
Each boy admitted to shooting the family pet six times until it died.
The teens also admitted to shooting several deer and smashing three mailboxes with a baseball bat.
The teenagers were released into the custody of their parents and are back in class at Montgomery Area High School.
Investigators said additional charges will be filed against the boys by the Pennsylvania Game Commission.
As for the Yoder family, Mrs. Yoder said her children are heartbroken, but they want to get another donkey. She said the kids want to name that donkey Eeyore as well.  http://wnep.com/2014/04/24/three-teens-charged-with-killing-donkey/
It seems like these thugs targeted the farm because it was an Amish farm and they knew that the Amish would not retaliate against them.
So, why isn't this a hate crime, Eric Holder?