Police Pepper Spray an 8 year old boy

I watched this interview this morning on Good Morning America and after watching this young boy and his mother I found myself thinking the police did the right thing. I felt like this mom was in denial and wanting to point fingers at everyone but herself. She needs to get this boy the help that he needs and deserves so he has a chance. The mom indicated she wished the police would have waited for her to get there...well, he was threatening to kill the teachers and the police with a sharp object and who's to say he wouldn't do anything??? Would love some other thoughts on this story. I found myself shaking my head this morning watching this...