Gun owners do not really lock up their guns. In any case, this was HIS GUN. His father just acted as the buyer since it was not legal for him to do it. He didn't steal a gun and it is hard to prove neglegence on the parents part. If you have a son who is a teen you will definitely teach him to shoot and let them know how to access the gun, as he may need to defend his house, himself or his family with it.
Cops in schools do not help much. Number one, they hide/run from school shooters themselves. Also, they tend to be bullies and enforce Karen level policy like beating up kids who take two milks or owe lunch debt, and chioking out kids who talk back to administrators. I grew up in Queens, Ny and worked in the Hempstead School District(real life version of the war zone schools from movies like Dangerous Minds). The cops did nothing and don't care. We had legit gang wars, cops just called the local PD and hid behind locked doors. They do not even break up fights. Also, the schools where these shootings happen most are usually either mostly or slight majority white, and completely devoid of any conversation about stationing police there....so how does this talking point and blaming liberals/BLM do anything? Factually, one of the only schools where these things happen that had an actual cop was stationed at, the guy HID until the shooting stopped and the local PD moved in.
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It's not the end of the world, but we can see it from here.