From the local news reporting he was very friendly to them previously:
“What we have is a murdered Palestinian child by someone who is radicalized by the environment in which we live right now, that casts Palestinians as human animals,” said Ahmed Rehab, president of the Council on American-Islamic Relations in Chicago. “This person had no track record with the family. As a matter of fact, the father says he had built a treehouse for the boy, and allowed him to swim in a makeshift pool and brought him toys.”
The nonstop propaganda about Muslims as dangerous subhuman animals can turn a normal friendly relationship into a targeted and cold-blooded murder.